drm/i915/display: Remove TGL DC3CO support

Remove all Tiger Lake DC3CO-related functions from intel_psr.c and
intel_display_power_well.c, as the feature is not enabled and not used.
Also remove the TGL/DG1 DC3CO count debugfs entry from intel_dmc.c,
as DC3CO is not active on those platforms. A new debugfs entry for
Xe3LP will be added in a subsequent patch.

Remove the unused dc3co_exitline field from struct intel_psr and
struct intel_crtc_state, along with the corresponding EXITLINE register
read in intel_psr_get_config().

Changes in v2:
- Squash "Remove unused PSR dc3co_exitline field" and
  "Remove unused dc3co_exitline from crtc_state" into this patch

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/20260616162154.2630995-2-dibin.moolakadan.subrahmanian@intel.com

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