ARM: dts: stm32: remove shmem for scmi-optee on stm32mp15

Since the OP-TEE commit "plat-stm32mp1: scmi_server: default use OP-TEE
shared memory", integrated in OP-TEE 3.22.0-rc1, the default configuration
for STM32MP15x SoCs changes and CFG_STM32MP1_SCMI_SHM_SYSRAM is disabled
by default and the OP-TEE SMCI server uses OP-TEE native shared memory
registered by clients.

To be compatible with this configuration and the next OP-TEE versions,
this patch removes in the STM32MP15 SCMI device tree the SHMEM used by
OP-TEE SCMI and the associated reserved memory in the last 4KByte page
of SRAM.

Fixes: ea3414e1249e ("ARM: dts: stm32: move SCMI related nodes in a dedicated file for stm32mp15")
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/st/stm32mp15-scmi.dtsi

@@ -16,7 +16,6 @@ scmi: scmi {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			linaro,optee-channel-id = <0>;
-			shmem = <&scmi_shm>;
 
 			scmi_clk: protocol@14 {
 				reg = <0x14>;
@@ -60,21 +59,6 @@ scmi_usb33: usb33@2 {
 			};
 		};
 	};
-
-	soc {
-		scmi_sram: sram@2ffff000 {
-			compatible = "mmio-sram";
-			reg = <0x2ffff000 0x1000>;
-			#address-cells = <1>;
-			#size-cells = <1>;
-			ranges = <0 0x2ffff000 0x1000>;
-
-			scmi_shm: scmi-sram@0 {
-				compatible = "arm,scmi-shmem";
-				reg = <0 0x80>;
-			};
-		};
-	};
 };
 
 &reg11 {