FROMGIT: drm/virtio: implement blob resources: probe for the feature.

Let's proble for VIRTIO_GPU_F_RESOURCE_BLOB.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Acked-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200924003214.662-8-gurchetansingh@chromium.org
(cherry picked from commit 6815cfe602d03df1b3029081e1c4fb81a224d9fb
 git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

 master)

BUG=b:171715474
TEST=compile

Change-Id: I692d00d462a84201b8994a04a9141e863f01c379
Signed-off-by: Guenter Roeck <groeck@chromium.org>
(cherry picked from commit 6ec4f9a86ec8370b719cc24234295eee8926b931)