qcacmn: Avoid WMI TLV structures in NAN target_if

Refactor NAN target_if to make it wmi-type agnostic. Specifically
do not access wmi structures in NAN target_if. All the access to
wmi structures should happen in tlv and non-tlv specific wmi files.

Change-Id: I944b678fc501723d7cd26c9b21c4cc6ddb7fda4e
CRs-Fixed: 2159876