drm/i915/mtl: Add MTP ddc pin configuration

Meteorlake PCH reuses Alderlake vbt, DE pin mapping. Extend
ADL-P pin mapping for Meteorlake.

Bspec: 20124 does not have the mapping for MTP. Based on Bspec:49306, 64051,
it is concluded that MTP and ADL-P PCH have the same vbt -> DE pin pair mapping.

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221005002534.2966978-1-radhakrishna.sripada@intel.com