minigbm: virtio: Advertise BO_USE_SCANOUT correctly.

minigbm: virtio: Advertise BO_USE_SCANOUT correctly.

If host doesn't support BO_USE_SCANOUT for some format, we shouldn't
advertise it. Otherwise the bo will fail to allocate at host side
with minigbm.

BUG=b:145603024
TEST=tast run 127.0.0.1:9222 arc.Boot.vm

Change-Id: I9e2c8141462b630bf18cc8859df607dca7b335c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2076580
Reviewed-by: Jason Macnak <natsu@google.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Lepton Wu <lepton@chromium.org>
Commit-Queue: Lepton Wu <lepton@chromium.org>
Auto-Submit: Lepton Wu <lepton@chromium.org>