arm64: dts: freescale: Add phyBOARD-Polis-i.MX8MM support

Add initial support for phyBOARD-Polis-i.MX8MM.
Main features are:
	* Bluetooth and Wifi
	* CANFD
	* eMMC
	* i2c RTC
	* Ethernet
	* PCIe
	* RS232/RS485
	* SD-Card
	* SPI-NOR flash
	* USB
Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/Makefile

@@ -58,6 +58,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-icore-mx8mm-edimm2.2.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-kontron-n801x-s.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-mx8menlo.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-nitrogen-r2.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mm-phyboard-polis-rdk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-tqma8mqml-mba8mx.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-var-som-symphony.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw71xx-0x.dtb