Wifi: HAL API to query the list of usable channels

API can be used to query what modes (SAP, STA,
WFD Client, WFD Group Owner, TDLS, NAN) can be
supported on each channel for specified band.
Needs support from Wifi chip vendors.

Bug: 160212907
Test: VTS - VtsHalWifiV1_5TargetTest
Change-Id: Icf270b8c2ee14c794778421c9d988712c5c38380