qcacmn: Use macro WLAN_POLICY_MGR_ENABLE around policy_mgr API usage

Policy manager API usage in common scan module should be enclosed in
macro WLAN_POLICY_MGR_ENABLE, so that it can be optionally used along
with policy manager.

Change-Id: I76602657b4945a973f30d6b129a6b3896b9fdf9e
CRs-Fixed: 2042734
1 file changed