compositor-drm: Store width and height inside drm_fb

This will be used so we can later determine the compatibility of drm_fbs
without needing to introspect external state.

Differential Revision: https://phabricator.freedesktop.org/D1487

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Armin Krezović <krezovic.armin@gmail.com>
1 file changed