m7ul: consolidate device proprietary files under m7-gsm

Change-Id: I2910b5f13acf82d0c78110f3a97102aa75b72ee6
m7ul: remove GSM APN list

Change-Id: I3f9b41c73c8ad0664714f65df50ac34e74680e00
Merge "m7ul: consolidate device proprietary files under m7-gsm" into cm-10.2