src/arch: Update license headers missing paragraph 2

For the coreboot license header, we want to use two paragraphs.
See the section 'Common License Header' in the coreboot wiki
for more details.

Change-Id: I4a43f3573364a17b5d7f63b1f83b8ae424981b18
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/13118
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
12 files changed