a5: Rebase RIL class for cm-12.0

Change-Id: I98c80a185ab447b192f94860986e7c0a098723bf
a5: Remove few overlays which are not implemented in cm-12.0 yet

* Enable multiuser
* Add Ethernet support

Change-Id: Ia557b76cf04b1ca9961848b7c99cb240c5affe6d