vl: add virtio-vga-gl to the default_list

Do not instantiate an extra default VGA device if -device virtio-vga-gl
is provided.

Related to commit b36eb88 ("virtio-gpu:
add virtio-vga-gl")

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210701062421.721414-1-marcandre.lureau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

softmmu/vl.c

@@ -202,6 +202,7 @@ static struct {
     { .driver = "virtio-vga",           .flag = &default_vga       },
     { .driver = "ati-vga",              .flag = &default_vga       },
     { .driver = "vhost-user-vga",       .flag = &default_vga       },
+    { .driver = "virtio-vga-gl",        .flag = &default_vga       },
 };
 
 static QemuOptsList qemu_rtc_opts = {