m7vzw: move overlays to common based off mcc and mnc.

Change-Id: Ifd6ba8cfd972cc4e10c83618f60425a1a0c92186
m7vzw: update 4.3 fingerprint

Change-Id: Ic37841669a2360fa98aff6fb38d2188d8c713a30
m7vzw: Add setup-makefiles.sh convenience script

Change-Id: I67698185b56877449bd3d9e5b030274cd7329033
m7vzw: remove calls to nonexistent overlay

Change-Id: I73613bd00e408edbb04d98fce7f9e385bb1d59fa