drm/i915: Switch to intel_ types in debugfs display_info

Switch to using intel_ types in the  debugfs display_info code.
Should make it easier to handle bigjoiner etc. in the future.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191129185434.25549-3-ville.syrjala@linux.intel.com


Reviewed-by: Ramalingam C <ramalingam.c@intel.com>