drm/i915: Define VBT eDP/DP max lane count bits

Since version 244 the VBT can llimt the eDP/DP max lane count.
Add the bits.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220715202044.11153-5-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>