qcacmn: Validate SSID first while fetching peer pmksa

Validate the SSID & cache ID if SSID length is present in the
pmksa entry, as in FILS case only SSID and cache id are filled
and BSSID is not filled.

So validate the BSSID only if the SSID is not present.

Change-Id: Ia0a31f953869f00495fad597bb564ec706425312
CRs-Fixed: 3051530