RISC-V: Add kconfig option for QEMU virt machine

	help

	  This enables support for SiFive SoC platform hardware.

config SOC_VIRT

       bool "QEMU Virt Machine"

       select VIRTIO_PCI

       select VIRTIO_BALLOON

       select VIRTIO_MMIO

       select VIRTIO_CONSOLE

       select VIRTIO_NET

       select NET_9P_VIRTIO

       select VIRTIO_BLK

       select SCSI_VIRTIO

       select DRM_VIRTIO_GPU

       select HW_RANDOM_VIRTIO

       select RPMSG_CHAR

       select RPMSG_VIRTIO

       select CRYPTO_DEV_VIRTIO

       select VIRTIO_INPUT

       select SIFIVE_PLIC

       help

         This enables support for QEMU Virt Machine.

endmenu