drm/i915: Nuke PCH_MCC

MCC is derived from TGP, and we have no real need to
differentiate between the two. Thus remove PCH_MCC and
just declare it to be PCH_TGP compatible.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220630150600.24611-3-ville.syrjala@linux.intel.com


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