Before CFG/INI convergence to the new cfg module, hdd maintained
the infrastructure to parse ini items from WCNSS_qcom_cfg.ini and
push the value to hdd_config members. With all the cfg/ini moved
to the new converged CFG component, this infra is not required.
So cleanup the legacy ini infrastructure in HDD.
Change-Id: Ia028edd10682a0ac8ed6a663c20ba5f67b962f1d
CRs-Fixed: 2445314