Pekka Paalanen authored Jul 20, 2022 and Pekka Paalanen committed Jul 29, 2022

Pixman image formats are CPU-endianess dependent while drm_fourcc are
not. Standardise around drm_fourcc because DRM-backend uses them anyway.

This also makes Pixman-renderer use the same format as GL-renderer will
prefer on headless.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>