qcacld-3.0: Refactor "set dbg" ioctl processing

One of the HDD functions with the highest cyclomatic complexity is
__iw_setint_getnone(). In order to reduce the complexity there is a
plan to replace the existing switch with a vtable. As part of that
goal refactor the "set dbg" ioctl handling into separate functions.
Note that the existing logic that updates the fw_log_settings in the
HDD context is obsolete, so remove that logic as part of the
refactoring.

Change-Id: Ibf632d1ef37905ca8159ea997dc07e4f2f7d12cc
CRs-Fixed: 2348502
3 files changed