drm/i915/display: PSR Add delayed work to exit DC3CO

For DC3CO, idle_frames is programmed to 0, so PSR does not
enter deep sleep. Add delayed work to schedule DC3CO exit
after an idle duration derived from frame time (minimum
equivalent of 6 frames).

The work is re-armed from the PSR flush path on relevant frontbuffer
activity. Once the display remains idle, DC3CO is disabled, idle frames
are reprogrammed to their normal value, and DC6 is enabled to allow
deeper power savings.

Changes in v2:
- Squash "PSR set idle frames while exit from DC3CO"
  into this patch (Uma Shankar)
- Add cancel_delayed_work() in intel_psr_disable_locked()
  before clearing dc3co_eligible (Uma Shankar)

Changes in v3:
- Re-arm cancelled DC3CO work in psr resume
- Schedule DC3CO work from intel_psr_post_plane_update(). This is to
  make sure DC3CO work scheduling will happen even without psr flush,
  which may be a valid scenario.

Changes in v4:
- Remove unused function parameter enum fb_op_origin origin
that is never used in the function body. (Animesh)

Signed-off-by: Dibin Moolakadan Subrahmanian <dibin.moolakadan.subrahmanian@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patch.msgid.link/20260616162154.2630995-13-dibin.moolakadan.subrahmanian@intel.com

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