minigbm: mediatek: fix SCANOUT flag

All renderer target works are eligible for scanout, after looking
at mtk_plane_init.

BUG=b:151064316
TEST=Mirror mode works again on Kukui

Change-Id: Ife8948c167c1d75622404af573f8cc92b3516416
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2118463
Reviewed-by: David Stevens <stevensd@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Queue: Gurchetan Singh <gurchetansingh@chromium.org>
1 file changed