Support 6GHz band for getAvailableChannels() API

This commit adds the support of 6GHz band in the system API
getAvailableChannels().

Bug: 139354972
Test: atest com.android.wifi.server
Change-Id: I69276a4783c3b20bcaa06d0c8cb273c653bb5527
15 files changed
tree: aacc89a3cc9e23e006cad9e267eb0f83f5fd1105
  1. apex/
  2. service/
  3. PREUPLOAD.cfg