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/xilinx-versal-virt.dts b/arch/arm/dts/xilinx-versal-virt.dts
new file mode 100644
index 0000000..733e532
--- /dev/null
+++ b/arch/arm/dts/xilinx-versal-virt.dts
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/*
+ * Empty device tree for versal-virt board
+ *
+ * Copyright 2021 Google LLC
+ */
+
+/dts-v1/;
+
+/ {
+};