Add projection API to reprot Wi-Fi channels

Some projection protocols requires headunits to report supported Wi-Fi
channels. This CL exposes Wi-Fi framework hidden api as system API
within CarProjectionManager

Bug: 119041732
Test: atest CarServiceUnitTest
Change-Id: Ic1b802762a0b7eeaa9b69303c0fc91cba23d3a28
6 files changed