drm/i915/hdmi: convert g4x_hdmi.[ch] to struct intel_display
Going forward, struct intel_display is the main display device data
pointer. Convert as much as possible of g4x_hdmi.[ch] to struct
intel_display.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4fbaaa4cdab8ec020e5b3fb2f615b3c244c9da2d.1739378095.git.jani.nikula@intel.com