drm/i915: Remove i915_reg.h from intel_psr.c
Move some chicken registers to display header to make
intel_psr.c free from including i915_reg.h.
v3: Update commit header
v2: Use display header instead of gmd common include (Jani)
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patch.msgid.link/20260205094341.1882816-16-uma.shankar@intel.com