drm/i915: Protect CRC reg macro arguments for consistency

It's probably a good idea to start protecting all macro arguments
to avoid any cargo-cult mistakes when people go looking for examples
of how to define these things.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240531115342.2763-8-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>