drm/i915/crt: Rename some variables

Rename a bunch of local variables to the preferred
encoder/connector from intel_encoder/intel_connector.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241107161123.16269-10-ville.syrjala@linux.intel.com


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