dt-bindings: efm32: remove bindings for deleted platform

Commit cc611137 ("ARM: drop efm32 platform") removed the platform,
so no need to still carry the bindings.
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220615210720.6363-1-wsa@kernel.org

Documentation/devicetree/bindings/clock/efm32-clock.txt

-* Clock bindings for Energy Micro efm32 Giant Gecko's Clock Management Unit
-
-Required properties:
-- compatible: Should be "efm32gg,cmu"
-- reg: Base address and length of the register set
-- interrupts: Interrupt used by the CMU
-- #clock-cells: Should be <1>
-
-The clock consumer should specify the desired clock by having the clock ID in
-its "clocks" phandle cell. The header efm32-clk.h contains a list of available
-IDs.

Documentation/devicetree/bindings/i2c/i2c-efm32.txt

-* Energymicro efm32 i2c controller
-
-Required properties :
-
- - reg : Offset and length of the register set for the device
- - compatible : should be "energymicro,efm32-i2c"
- - interrupts : the interrupt number
- - clocks : reference to the module clock
-
-Recommended properties :
-
- - clock-frequency : maximal I2C bus clock frequency in Hz.
- - energymicro,location : Decides the location of the USART I/O pins.
-   Allowed range : [0 .. 6]
-
-Example:
-	i2c0: i2c@4000a000 {
-		#address-cells = <1>;
-		#size-cells = <0>;
-		compatible = "energymicro,efm32-i2c";
-		reg = <0x4000a000 0x400>;
-		interrupts = <9>;
-		clocks = <&cmu clk_HFPERCLKI2C0>;
-		clock-frequency = <100000>;
-		energymicro,location = <3>;
-
-		eeprom@50 {
-			compatible = "microchip,24c02";
-			reg = <0x50>;
-			pagesize = <16>;
-		};
-	};
-

Documentation/devicetree/bindings/serial/efm32-uart.txt

-* Energymicro efm32 UART
-
-Required properties:
-- compatible : Should be "energymicro,efm32-uart"
-- reg : Address and length of the register set
-- interrupts : Should contain uart interrupt
-
-Optional properties:
-- energymicro,location : Decides the location of the USART I/O pins.
-  Allowed range : [0 .. 5]
-  Default: 0
-
-Example:
-
-uart@4000c400 {
-	compatible = "energymicro,efm32-uart";
-	reg = <0x4000c400 0x400>;
-	interrupts = <15>;
-	energymicro,location = <0>;
-};

Documentation/devicetree/bindings/spi/efm32-spi.txt

-* Energy Micro EFM32 SPI
-
-Required properties:
-- #address-cells: see spi-bus.txt
-- #size-cells: see spi-bus.txt
-- compatible: should be "energymicro,efm32-spi"
-- reg: Offset and length of the register set for the controller
-- interrupts: pair specifying rx and tx irq
-- clocks: phandle to the spi clock
-- cs-gpios: see spi-bus.txt
-
-Recommended properties :
-- energymicro,location: Value to write to the ROUTE register's LOCATION
-                        bitfield to configure the pinmux for the device, see
-                        datasheet for values.
-                        If this property is not provided, keeping what is
-                        already configured in the hardware, so its either the
-                        reset default 0 or whatever the bootloader did.
-
-Example:
-
-spi1: spi@4000c400 { /* USART1 */
-	#address-cells = <1>;
-	#size-cells = <0>;
-	compatible = "energymicro,efm32-spi";
-	reg = <0x4000c400 0x400>;
-	interrupts = <15 16>;
-	clocks = <&cmu 20>;
-	cs-gpios = <&gpio 51 1>; // D3
-	energymicro,location = <1>;
-
-	ks8851@0 {
-		compatible = "ks8851";
-		spi-max-frequency = <6000000>;
-		reg = <0>;
-		interrupt-parent = <&boardfpga>;
-		interrupts = <4>;
-	};
-};

include/dt-bindings/clock/efm32-cmu.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __DT_BINDINGS_CLOCK_EFM32_CMU_H
-#define __DT_BINDINGS_CLOCK_EFM32_CMU_H
-
-#define clk_HFXO		0
-#define clk_HFRCO		1
-#define clk_LFXO		2
-#define clk_LFRCO		3
-#define clk_ULFRCO		4
-#define clk_AUXHFRCO		5
-#define clk_HFCLKNODIV		6
-#define clk_HFCLK		7
-#define clk_HFPERCLK		8
-#define clk_HFCORECLK		9
-#define clk_LFACLK		10
-#define clk_LFBCLK		11
-#define clk_WDOGCLK		12
-#define clk_HFCORECLKDMA	13
-#define clk_HFCORECLKAES	14
-#define clk_HFCORECLKUSBC	15
-#define clk_HFCORECLKUSB	16
-#define clk_HFCORECLKLE		17
-#define clk_HFCORECLKEBI	18
-#define clk_HFPERCLKUSART0	19
-#define clk_HFPERCLKUSART1	20
-#define clk_HFPERCLKUSART2	21
-#define clk_HFPERCLKUART0	22
-#define clk_HFPERCLKUART1	23
-#define clk_HFPERCLKTIMER0	24
-#define clk_HFPERCLKTIMER1	25
-#define clk_HFPERCLKTIMER2	26
-#define clk_HFPERCLKTIMER3	27
-#define clk_HFPERCLKACMP0	28
-#define clk_HFPERCLKACMP1	29
-#define clk_HFPERCLKI2C0	30
-#define clk_HFPERCLKI2C1	31
-#define clk_HFPERCLKGPIO	32
-#define clk_HFPERCLKVCMP	33
-#define clk_HFPERCLKPRS		34
-#define clk_HFPERCLKADC0	35
-#define clk_HFPERCLKDAC0	36
-
-#endif /* __DT_BINDINGS_CLOCK_EFM32_CMU_H */