qcacmn: Don't add pmkid count field in initial association

In the initial connection association request, since the STA
doesn't have pmkid, it sends the 2 byte pmkid field as 0.
But some APs dont allow pmkid count field to be 0 during
association and pmkid field having some value in EAPOL
handshake and triggers disconnection with reason code 17(
Information element in 4-way handshake different from Assoc
request). With crypto component disabled, the legacy
rsn ie construction doesn't add the 2 bytes with 0 value for
non-PMF connections.

So don't add pmkid count with 0 value in initial association
request for non-PMF connections.

Change-Id: I90441167ee480bf5d08e73e43d3ee9371bd16b0a
CRs-Fixed: 2783639