The updated README now mentions that some files are derived from BSD,
so update the LICENSE to be PD & BSD.
(From OE-Core rev: 063f67f5ecbe6edc226e1a25b5b8387881592c34)
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>