device/oprom/yabel: Update BSD license headers

All of the yabel files are BSD licensed.

Change-Id: Ibe0b3bb67a96c57b5d693676f5e8f19b6bed90fa
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12972
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
19 files changed