OvmfPkg/RiscVVirtQemu.dsc: enable VGA support
QEMU enables CONFIG_VIRTIO_VGA by default. Libvirt falls back from virtio-gpu-pci to virtio-vga if made available by QEMU. We need to enable VGA support to get video output for EDK II in virt-manager:
Driver QemuVideoDxe is added to OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc/.fdf
Edited by Heinrich Schuchardt