seabios: update submodule to 1.12.1

git shortlog rel-1.12.0..rel-1.12.1
===================================

Kevin O'Connor (1):
      usb-ehci: Clear pipe token on pipe reallocate

Stephen Douthit (1):
      tpm: Check for TPM related ACPI tables before attempting hw probe

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

seabios @ a5cab58e

-Subproject commit a698c8995ffb2838296ec284fe3c4ad33dfca307
+Subproject commit a5cab58e9a3fb6e168aba919c5669bea406573b4