qcacld-3.0: Convert wlan_hdd_cfg.c to unified logging

Currently the HDD code uses a variety of logging APIs.  In qcacld-3.0
HDD should converge on a unified set of logging APIs.  Update
wlan_hdd_cfg.c to use the unified set of APIs.

Change-Id: I5d55481198e5b0807afb40a3f7e3962aeb8d728a
CRs-Fixed: 937645