m7ul: Add setup-makefiles.sh convenience script

Change-Id: I5fe21f1fca2a4cd9a427764012a175321959332b
m7ul: remove call to nonexistent overlay

Change-Id: If132fa0babde21f7b3e945cc822b1b2e57baac5f
m7ul: shift to common m7 tree

Change-Id: I858209f69a98f23f3216573446f61e2f2637df42