virtio-mem: Enable virtio-mem for RISC-V

Now that RISC-V has memory hotplugging support, virtio-mem can be used
on the platform.

Acked-by: David Hildenbrand <[e-mail]>
Signed-off-by: Björn Töpel <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Palmer Dabbelt <[e-mail]>

drivers/virtio/Kconfig

···
 
 config VIRTIO_MEM
 	tristate "Virtio mem driver"
-	depends on X86_64 || ARM64
+	depends on X86_64 || ARM64 || RISCV
 	depends on VIRTIO
 	depends on MEMORY_HOTPLUG
 	depends on MEMORY_HOTREMOVE