m7att: Add setup-makefiles.sh convenience script

Change-Id: I73750492824141b48650baf56962370422db927f
m7att: remove call to nonexistent overlay

Change-Id: I171da3d7bf94267c4199a5313162ecc493b0760c
m7att: shift to common m7 tree

Change-Id: I950e5c76116c14ee63ec786d160b85d17886f678