arm: xilinx_versal_virt: Add a devicetree file

Add an empty file to prevent build errors when building with
CONFIG_OF_SEPARATE enabled.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 9130211..b07a1b3 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -360,7 +360,8 @@
 dtb-$(CONFIG_ARCH_VERSAL) += \
 	versal-mini.dtb \
 	versal-mini-emmc0.dtb \
-	versal-mini-emmc1.dtb
+	versal-mini-emmc1.dtb \
+	xilinx-versal-virt.dtb
 dtb-$(CONFIG_ARCH_ZYNQMP_R5) += \
 	zynqmp-r5.dtb
 dtb-$(CONFIG_AM33XX) += \