qcacld-3.0: Rename SAP identifier pUsrContext

The Linux Coding Style frowns upon mixed-case names and so-called
Hungarian notation, so rename SAP identifier pUsrContext to be
compliant.

Change-Id: Ib9c4cac6eb6f813e4da66c1c65bab16cebf62946
CRs-Fixed: 2422209
5 files changed