FT: Include pairwise cipher suite in PMK-R0 SA and PMK-R1 SA

FT: Include pairwise cipher suite in PMK-R0 SA and PMK-R1 SA

This is needed to fix PTK derivation to use correct length. Previously,
64-octet PTK may have been derived if the authenticator did not already
have a STA entry. Now, the correct pairwise cipher suite is learned when
then PMK-R1 SA is received.