DO_NOT_MERGE riscv: dts: build qemu virt device tree

Add the device tree for the qemu virt machine to the build. The
resulting dtb will be consumed by qemu-system-riscv64.

Co-developed-by: Adrien Ricciardi <aricciardi@baylibre.com>
Signed-off-by: Adrien Ricciardi <aricciardi@baylibre.com>
Signed-off-by: Drew Fustini <dfustini@baylibre.com>

arch/riscv/boot/dts/Makefile

@@ -5,5 +5,6 @@ subdir-y += starfive
 subdir-y += canaan
 subdir-y += microchip
 subdir-y += renesas
+subdir-y += qemu
 
 obj-$(CONFIG_BUILTIN_DTB) := $(addsuffix /, $(subdir-y))

arch/riscv/boot/dts/qemu/Makefile

+# SPDX-License-Identifier: GPL-2.0
+dtb-$(CONFIG_SOC_VIRT) += qemu-virt-cbqri.dtb
+obj-$(CONFIG_BUILTIN_DTB) += $(addsuffix .o, $(dtb-y))