qcacld-3.0: Refine iw_get_oem_data_cap()

The current implementaton of iw_get_oem_data_cap() has a few issues:
- It has identifiers with mixed-case and Hungarian notation
- It performs an unnecessary data copy

So refine the function to address these issues.

Change-Id: I3d445ea4024e072d66c3d59e8773d0ad72eb6178
CRs-Fixed: 2413669
1 file changed