m7-common: Remove unnecessary LTE overlay option

* This is now defined in vendor/cm

Change-Id: I2e9730d33699f938a05421640cfeb1d798c16015
m7-common: Revert Speaker DMIC Endfire to stock values

* This matches HTC's stock M7 configuration.

Change-Id: I9006793b2f59600b7ca4fdd15f5ace0a60d9c337