WPS NFC: Update NFC connection handover design

WPS NFC: Update NFC connection handover design

The new Device Password ID 7 is used to indicate that NFC connection
handover is used with DH public key hash from both devices being
exchanged over the NFC connection handover messages. This allows an
abbreviated M1-M2 handshake to be used since Device Password does not
need to be used when DH is authenticated with the out-of-band
information (validation of the public key against the hash).

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>