seabios: update to 1.11 final

Update our pre-release seabios snapshot to the final release.

git shortlog
============

Gerd Hoffmann (1):
      sercon: Disable ScreenAndDebug in case both serial console and serial debug are active

Kevin O'Connor (2):
      timer: Avoid integer overflows in usec and nsec calculations
      docs: Note v1.11.0 release

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
