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>

arch/arm/dts/Makefile

@@ -360,7 +360,8 @@ dtb-$(CONFIG_ARCH_ZYNQMP) += \
 dtb-$(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) += \

arch/arm/dts/xilinx-versal-virt.dts

+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/*
+ * Empty device tree for versal-virt board
+ *
+ * Copyright 2021 Google LLC
+ */
+
+/dts-v1/;
+
+/ {
+};

configs/xilinx_versal_virt_defconfig

@@ -7,6 +7,7 @@ CONFIG_SYS_MALLOC_F_LEN=0x100000
 CONFIG_SYS_MEMTEST_START=0x00000000
 CONFIG_SYS_MEMTEST_END=0x00001000
 CONFIG_DM_GPIO=y
+CONFIG_DEFAULT_DEVICE_TREE="xilinx-versal-virt"
 CONFIG_CMD_FRU=y
 CONFIG_DEFINE_TCM_OCM_MMAP=y
 CONFIG_COUNTER_FREQUENCY=100000000