m7att: consolidate device proprietary files under m7-gsm

Change-Id: Ib42bdbd1fa26dd7f5afad5de3bb1e2e31fe3c5a3
m7att: remove GSM APN list

Change-Id: I020ca744c5604e13a237d394cffa667d09a9e4d8
Merge "m7att: consolidate device proprietary files under m7-gsm" into cm-10.2
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_device_htc_m7att into cd-4.3

Conflicts:
	cd.mk

Change-Id: Icaf57aef3b7b03c75ddea9577f0bd096e56b37a6