drm/i915: Remove counter productive REGION_* wrappers

This extra macro level between the region IDs and their bitmasks
just makes it harder to see what is used where. Get rid of the
wrappers.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240502121423.1002-3-ville.syrjala@linux.intel.com


Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>