drm/i915/mtl: Reuse adl-p DBUF calculations

Meteorlake uses a similar DBUF calculations as ADL-P.
Reuse the call flow for meteorlake.

Bspec: 49255

Original Author: Caz Yokoyama
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220818234202.451742-19-radhakrishna.sripada@intel.com