src/mainboard: Add and update license headers

This change adds and updates headers in all of the mainboard files that
had missing or unrecognized headers.  After this goes in, we can turn on
lint checking for headers in all mainboard directories.

Change-Id: Ibe038a8f7468253b21fd2ac90c045d0c9cc89dfc
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/26568
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
90 files changed