drm/i915/display: Add function to configure event for dc balance

drm/i915/display: Add function to configure event for dc balance

Configure pipe dmc event for dc balance enable/disable.

--v2:
- Keeping function and removing unnecessary comments. (Jani, Nikula)

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/20251223104542.2688548-18-mitulkumar.ajitkumar.golani@intel.com