qcacld-3.0: Remove usage of sta_id in TSM stats path

Currently driver passes sta_id through out the call for getting the TSM
stats. Although passed, the sta_id is not used anywhere in the call
stack. As part of removing the sta_id usage, this sta_id can also be
removed safely.

Remove the usage of sta_id in get TSM stats path.

Change-Id: I1efbb1bfdc8df84e9b6a71dcd5bd39ea93ced21a
CRs-Fixed: 2484701
9 files changed