qcacld-3.0: Converge on struct plm_req_params

The driver currently defines two different data structures to hold
PLM Request parameters:
- legacy struct plm_req
- unified WMI struct plm_req_params

To align with the converged software architecture remove the legacy
definition and exclusively use the unified WMI definition.

Change-Id: I7675686aba9590a4507a8f9ebffcbf181ee00a21
CRs-Fixed: 2411817
6 files changed