Revert "drm/i915/bios: Split VBT parsing to global vs. panel specific parts"

This reverts commit 2af21ae8 which is
commit c2fdb424

 upstream.

This is part of a series of i915 patches that were backported to 5.19.12
but found to be incomplete and caused problems on many systems so they
are being reverted.

Reported-by: Jerry Ling <jiling@cern.ch>
Reported-by: Hans de Goede <hdegoede@redhat.com>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Sasha Levin <sashal@kernel.org>
Link: https://lore.kernel.org/all/55905860-adf9-312c-69cc-491ac8ce1a8b@cern.ch/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>