P2P: Change supplicant scan intervel during WFD session

During WFD session supplicant scan intervel is one minute. If
there are some saved profiles, then supplicant will issue a scan
for every one minute, this is causing some ping latency in WFD.
Hence supplicant scan intervel should change to five minutes
to improve ping latency in WFD session only.
Change-Id: If827bab6f186ebeaac90f297935bc8b987eb4d09
CRs-Fixed: 669404