imx8mn_var_som: Add support for Variscite VAR-SOM-MX8M-NANO board

Add support for iMX8MN VAR-SOM-MX8M-NANO board. Enables support for:

- 1GiB DDR4 RAM
- 16 GiB eMMC
- SD card
- Gigabit ethernet
- USBOTG1 peripheral - fastboot

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/mach-imx/imx8m/Kconfig b/arch/arm/mach-imx/imx8m/Kconfig
index 6c20d08..4da19f7 100644
--- a/arch/arm/mach-imx/imx8m/Kconfig
+++ b/arch/arm/mach-imx/imx8m/Kconfig
@@ -112,6 +112,13 @@
 	select IMX8MQ
 	select IMX8M_LPDDR4
 
+config TARGET_IMX8MN_VAR_SOM
+	bool "imx8mn_var_som"
+	select BINMAN
+	select IMX8MN
+	select SUPPORT_SPL
+	select IMX8M_DDR4
+
 config TARGET_VERDIN_IMX8MM
 	bool "Support Toradex Verdin iMX8M Mini module"
 	select BINMAN
@@ -179,6 +186,7 @@
 source "board/phytec/phycore_imx8mp/Kconfig"
 source "board/ronetix/imx8mq-cm/Kconfig"
 source "board/technexion/pico-imx8mq/Kconfig"
+source "board/variscite/imx8mn_var_som/Kconfig"
 source "board/toradex/verdin-imx8mm/Kconfig"
 
 endif