m7vzw: default to Global network mode

Change-Id: I4e50681cf70cf2a8e99f629bd602e13dbd7de355
m7vzw: remove unneeded overlay definition

Change-Id: Ief80e861108d494c222cb4e3c8dd13cf3c3a26bd
Merge "m7vzw: default to Global network mode" into kk4.4
Merge "m7vzw: remove unneeded overlay definition" into kk4.4