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/dts/Makefile b/arch/arm/dts/Makefile
index e9e58c5..773c254 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -1125,7 +1125,8 @@
 	imx8mq-librem5-r4.dtb
 
 dtb-$(CONFIG_ARCH_IMX9) += \
-	imx93-11x11-evk.dtb
+	imx93-11x11-evk.dtb \
+	imx93-var-som-symphony.dtb
 
 dtb-$(CONFIG_ARCH_IMXRT) += imxrt1050-evk.dtb \
 	imxrt1020-evk.dtb \