drm_hwcomposer: Define DRM_FORMAT_XYUV8888 if missing

Fixes drm_hwcomposer build for Android-9.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
Change-Id: I14e931c37c3d09284dfd338e6482a27cf21e0e10
2 jobs for pie-support-2022w06 in 16 minutes and 10 seconds (queued for 1 second)