P2PS: Process channels in PD Response

P2PS: Process channels in PD Response

In case the P2PS PD Response includes the P2P Channel List attribute,
update the peer device supported channels and verify that the local
device has common channels with the peer (only a sanity check).

If the Operating Channel attribute is included in the response, check
that it is included in the intersection and store it as the peer's
operating frequency (so it could later be used in the join flow, etc.).

Signed-off-by: Ilan Peer <ilan.peer@intel.com>