qcacld-3.0: Remove addStaSessionCmd from tSmeCmd

Field addStaSessionCmd in struct tSmeCmd is unused, so remove it.
Since that field is the only user of struct addstafor_sessioncmd
remove that as well.

Change-Id: I5624ab301c11045de34781dc4dff3ef7d2c784d8
CRs-Fixed: 2361287
2 files changed