drm/i915/psr: Move pr_dpcd and psr_dpcd to intel_connector

drm/i915/psr: Move pr_dpcd and psr_dpcd to intel_connector

As a preparation for MST Panel Replay we need to move Panel Replay sink
related data into intel_connector. Move pr_dpcd as well into
intel_connector. Generally this is more correct place for this data so move
psr_dpcd as well.

v2:
  - move pr/psr_dpcd into *_caps substruct
  - drop intel_dp from psr2_su_region_et_valid and
    _panel_replay_compute_su_granularity parameters

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251204104733.1106145-5-jouni.hogander@intel.com