drm/i915: Fix ehl edp hbr2 vswing table

EHL is supposed to use special buf trans values for eDP HBR2+.
Add such a table.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210608073603.2408-15-ville.syrjala@linux.intel.com


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