drm/i915/connector: convert intel_connector.c to struct intel_display

drm/i915/connector: convert intel_connector.c to struct intel_display

Going forward, struct intel_display is the main display device data
pointer. Convert as much as possible of intel_connector.c to struct
intel_display. i915_inject_probe_failure() remains the only call that
requires i915 pointer.

Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://lore.kernel.org/r/398e3210459a65f74e78f2d34584cda6eea6a99b.1742481923.git.jani.nikula@intel.com