We have only two defines that aren't from DRM_FORMAT_*: SARGB and
SABGR. Keep only those as __DRI_IMAGE_FOURCC and garbage collect the
rest.
While this header is also used from the X server, the X server doesn't
use any __DRI_IMAGE enums.
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
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