Revert "[WIFICOND][API] Update channel API from array to list"

This reverts commit 98b1d8d5a25249b64432746b18e40b084201cef8.

[API council request]

Bug: 148680192
Test: atest android.net.wifi
Change-Id: Id532feaa0b18d681bda317a68c0ebbd43761d183
3 files changed