board: phytec: imx8mm: Add PHYTEC phyCORE-i.MX8MM support

Add support PHYTEC phyCORE-i.MX8MM SOM.

Supported features:
 - 2GB LPDDR4 RAM
 - 1x 1Gbit Ethernet
 - eMMC
 - external SD
 - debug UART3
 - watchdog
 - i2c eeprom

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 5362b73..6ce52b9 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -770,6 +770,7 @@
 dtb-$(CONFIG_ARCH_IMX8M) += \
 	imx8mm-evk.dtb \
 	imx8mm-verdin.dtb \
+	phycore-imx8mm.dtb \
 	imx8mn-ddr4-evk.dtb \
 	imx8mq-evk.dtb \
 	imx8mm-beacon-kit.dtb \