drm_hwcomposer: Submit in-fence to DRM

Add support for in-fences through the IN_FENCE_FD property. In-fences signal
when their associated buffer may be read by DRM/KMS.

Signed-off-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
1 file changed