drm/i915/psr: further conversions to struct intel_display

intel_psr.c still uses the old platform identification macros. Convert
them and some other stragglers to struct intel_display.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://lore.kernel.org/r/7d032bd621a56536b4d53c5c415cad624e5dc628.1742906146.git.jani.nikula@intel.com


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