wifi: error out when asked for factory mac address

 * In Android 10, every time a wifi connection is to be established
   the mac address is reset to factory. This was introduced to play
   with "Connected MAC randomization".

 * InterfaceTool::GetFactoryMacAddress fetches the factory mac address
   by dispatching a SIOCETHTOOL ETHTOOL_GPERMADDR ioctl.
   On our legacy wifi drivers it returns 00:00:00:00:00:00,
   and android proceeds to set it as wlan0's mac address causing
   the connection to fail.

 * Hard code an ERROR_NOT_SUPPORTED return status to get around it.

Change-Id: I1afb3d7ed0ad745da9828db0074caa970407bdc5
1 file changed