Set up Vold switchable pair to allow swapping internal/external SD

Uncomment the line persist.sys.vold.switchexternal=1 in bulid prop
to use

Change-Id: I90cf2ebbdcf1e8d03b433817832de43023441e5f
Move ro.telephony.ril.v3 to data/local.prop to allow setting change

Change-Id: I04922b48d0d45b7ae41af367b9a523b4ee679d46
Add world_phone config

Change-Id: I26298db982b140731ab402a306e8f8a43d101184
Use shared defconfig

Change-Id: I1f8ae7bfedf5b69af232be6eba5b15126bf3413c

Conflicts:
	BoardConfig.mk