Add APIs for Wifi/Cellular coex channel avoidance

Added SystemApis for getting and setting the unsafe channels to avoid
for framework Wifi/Cellular coex channel avoidance.

Bug: 153651001
Test: atest WifiManagerTest, atest CoexUnsafeChannelTest
Change-Id: I4cb4137766c23f096951a2a5a4df1bd946f6c446
8 files changed
tree: 0bb888ec0696a4b317af0f6637e2864bff65f55e
  1. framework/
  2. OsuLogin/
  3. OWNERS