qcacld-3.0: Policy manager update for channel to frequency usage

Update policy manager data structures and APIs to use frequency
instead of channels. This is done to address channel number
ambiguity with introduction of 6GHZ band. Fix all references of
channel and add temporary internal functions for frequency
usage as replacement for public APIs using channels. Also modify
the channel list handling to frequency list in associated modules.

Change-Id: I11dff14a5fbe6d49cf411f8fce6863994ffccd75
CRs-fixed: 2540000
14 files changed