EasyMesh spec does not support 6 GHz officially. Our EasyMesh application
only supports 6 GHz in very new version.
Add parameter for the interface between SON and Wlan driver, so that
including 6 GHz or not can be configurable.
Change-Id: I37b07697200747521bec598806cb533774fa3a91
CRs-Fixed: 3256469