At one time the WLAN driver only supported a single SAP. At that time
most SAP APIs took the global context pointer as a param, and from
that they could extract the pointer to the one & only SAP context.
Later the MBSSID feature was added, and conditional compilation was
introduced such that either the global context pointer or a per-BSS
SAP context pointer was used. Finally in qcacld-3.0 the conditional
compilation was removed, leaving just the MBSSID behavior. However one
of the artifacts that was left behind was that the SAP APIs are
currently defined to take a void *context which prevents the compiler
from performing proper type checking.
Update wlansap_open() to return the true struct pointer type so that
it can then be used by other SAP APIs.
Change-Id: I216ed653e4feb9960357a168d4981e7a7a92411e
CRs-Fixed: 2116267
2bc0b727e3