Add imx93-var-som support

Add support for the Variscite VAR-SOM-IMX93 evaluation kit. The SoM
consists of an NXP iMX93 dual A55 CPU. The SoM is mounted on a Variscite
Symphony SBC.

Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>
diff --git a/arch/arm/mach-imx/imx9/Kconfig b/arch/arm/mach-imx/imx9/Kconfig
index 7ba3835..28202df 100644
--- a/arch/arm/mach-imx/imx9/Kconfig
+++ b/arch/arm/mach-imx/imx9/Kconfig
@@ -32,9 +32,16 @@
         select BINMAN
 	select IMX93
 
+config TARGET_IMX93_VAR_SOM
+	bool "imx93_var_som"
+        select BINMAN
+	select IMX93
+	select IMX9_LPDDR4X
+
 endchoice
 
 source "board/freescale/imx93_evk/Kconfig"
+source "board/variscite/imx93_var_som/Kconfig"
 
 endif