qcacld-3.0: Use MAX_PMKID_LEN in cds_fils_connection_info
Currently in cds_config.h the macro MAX_PMKID_LEN is not used, and the
pmkid field in struct cds_fils_connection_info uses the "magic number"
16, so replace the magic number with the macro.
Change-Id: I11e7f55d43e5cdd3f222f54434a33c94654f2384
CRs-Fixed: 2366959