license: add the bsd-3-clause
license: add the bsd-3-clause

Carrying forward the BSD-3 clause license as
some of this code was pushed first into DPDK

Signed-off-by: Nicolas Chautru <5844138a49a7cd19205c4efe0c7b4bd431c6ad19@intel.com>

intel/pf-bb-config,intel/pf-bb-config