drm/i915/bios: Define VBT block 57 (Vswing PreEmphasis Table) contents

drm/i915/bios: Define VBT block 57 (Vswing PreEmphasis Table) contents

Define the contents of VBT block 57 (Vswing PreEmphasis Table).

The contents is highly platform specific. The columns of the
table corresponding to some set of PHY/etc registers. The rows
corresponding to all legal vswing+pre-emphasis combinations
(ie. should be 10 rows in each table). And each table
corresponds to a platform specific (mostly undocumented)
mapping based on link rate/eDP low-vswing/etc. parameters.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503122449.27266-32-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>