drm/i915/vrr: Pause DC Balancing for DSB commits

drm/i915/vrr: Pause DC Balancing for DSB commits

Pause the DMC DC Balancing for the remainder of the
commit so that vmin/vmax won't change after we've baked
them into the DSB vblank evasion commands.

--v2:
- Remove typo. (Ankit)
- Separate vrr enable structuring. (Ankit)

--v3:
- Add gaurd before accessing DC balance bits.
- Remove redundancy checks.

--v4:
- Move events to separate function.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20251223104542.2688548-17-mitulkumar.ajitkumar.golani@intel.com