[WifiCoex] Refactor to use updated PhysicalChannelConfig API

Refactor coex algo to use updated PhysicalChannelConfig API and add a
data structure class for holding cell info used in the coex algo.

Bug: 153651001
Test: atest FrameworksWifiTests
Change-Id: I4deb4ee0290d2ee2ecf87cf6354e7a0c2acf7386
6 files changed