drm/i915/vrr: Program CMRR enable/disable from transcoder timings

Move the CMRR M/N register writes into a new
intel_vrr_set_cmrr_timings() helper called from
intel_vrr_set_fixed_rr_timings(), so CMRR is programmed together with
the fixed rr timings for both the CMTG and CPU transcoder, instead of
being open-coded in intel_vrr_set_transcoder_timings(). Drop the
now-unused cmrr_enable argument to intel_vrr_tg_enable().

No functional change intended for non-CMRR configurations.

--v2:
- Commit message changes.
- Added Simplified enable/disable sequence. (Chaitanya)

--v3:
- Guard CMRR enable condition (Chaitanya)
- Comment changes updated (Chaitanya)
- Squash register write commits together and
avoid double writing issue. (Chaitanya)

--v4:
- Guard CMRR enable/disable with platform check

--v5:
- Update CMRR in enable/disable path

--v6:
- Simplify enable/disable calls (Chaitanya)
- Make function usable for common cmtg and cpu transcoder
(Chaitanya)

--v7:
- Update commit message (Chaitanya)

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Assisted-by: Claude:claude-opus-4-8
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260730105919.3913412-9-mitulkumar.ajitkumar.golani@intel.com

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