Use virtio-gpu with viogpudo on Arm64 Windows 11

Replace ramfb with virtio-gpu-pci at 2048x1280 and install the viogpudo
driver from the VirtIO ISO. ramfb has a fixed mode, and keeping both
adapters left Windows with a second, fixed-mode monitor.

Windows Setup and the base image have no viogpudo driver, so on the
launch that creates the system disk the launcher also adds a ramfb ahead
of the config files. The display window shows the first GPU.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

run-windows11.py

@@ -372,7 +372,12 @@ for label, host_port, guest_port in (("RDP", rdp_port, 3389), ("SSH", ssh_port,
     else:
         forwards.append(f"hostfwd=tcp::{host_port}-:{guest_port}")
 
-qemu_args = [
+# Neither Windows Setup nor the base image has the viogpudo driver yet, and
+# without it the virtio-gpu in the config file shows "display output is not
+# active". ramfb shows the screen until Configure-Windows.ps1 installs it. It
+# must be created before the virtio-gpu: the display window shows the first GPU.
+qemu_args = ["-device", "ramfb"] if installing and host_arch == "arm64" else []
+qemu_args += [
     "-readconfig", str(qemu_config),
     "-readconfig", str(qemu_platform_config),
     # "max" is the host CPU under KVM/HVF and the fullest model under TCG.