m7ul: remove call to nonexistent overlay

Change-Id: If132fa0babde21f7b3e945cc822b1b2e57baac5f
m7ul: rename device to m7

* Use this tree as the common M7 GSM tree

Change-Id: I7f145d3aa948c11121b6dae42603b87c2e9d36b5
m7: Use carrier overlays for ATT/TMO LTE APN

Change-Id: I841f9bb89ccd4273cc967de72f81df1d17515d6a
m7: PA bringup for Htc One Gsm Variants

Signed-off-by: houst0nn <houstonn@gmail.com>