EthernetDevInfo: Clean up formatting

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
Ethernet: Update API

* Rename addr() methods to address()
* Move getMacFromEfuse() out of Settings and make it usable in API as
     getMacAddress()
* Add fallback to all get*Address() methods to read from prop or report
     Unavailable

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>