Apparently when the VBT panel_type==0xff we should trawl through
the PNPID table and check for a match against the EDID. If a
match is found the index gives us the panel_type.

Tried to match the Windows behaviour here with first looking
for an exact match, and if one isn't found we fall back to
looking for a match w/o the mfg year/week.

v2: Rebase due to vlv_dsi changes
v3: Adjust to .get_panel_type() vfunc

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5545Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220510104242.6099-14-ville.syrjala@linux.intel.com