Add overlays to stop Carrier Roaming, remove Reboot Bootloader (Not Used)
from power menu, show 4G for LTE, and also carrier settings.

Change-Id: I75ea7778a932837eb43bb47cacfdd99e64e9a5fb
Add more overlays, for frameworks, including hardware keys overlay
setup (volume rocker) & tcp buffersizes, so now remove buffersizes
from init.g2.rc

Change-Id: I5f7705138c68a751563bb6f5b15f97fd5477825f