Define a new timestamp to identify the completion of Auxiliary Firmware Sync. Without that, it gets accounted into a different timestamp ID in a misleading way. BUG=None TEST=Build Brox BIOS image and boot to OS. Confirm the timestamp is recorded in cbmem. Change-Id: Icd01c68a5848e2aed7bbdcc794987bc780e78dab Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/82230 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: Shelley Chen <shchen@google.com>