libcbm: use GBM usage GBM_BO_USE_LINEAR to import gralloc buffers

Using GBM_BO_USE_LINEAR is temporary. We should use a camera-specific
usage flag to import gralloc buffer to GBM after we add the usage flag
in minigbm.

BUG=b:36377554
TEST=Test video recording in camera app on elm.

Change-Id: I93e55657e2652a87dd226416ff2a910f9827ffa0
Reviewed-on: https://chromium-review.googlesource.com/536675
Commit-Ready: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Hung-yu Wu <hywu@chromium.org>
1 file changed