m7ul: Correct manufacturer, htc to HTC

Change htc for m7ul manufacter to HTC to make the string look cleaner
in Android Device Manager and Google Play Store (commonly used by users),
as well as any app that reads ro.product.manufacturer from build.prop.
Also, HTC styles their name in print as being uppercase and generally have
it uppercase in their stock ROMs.

Change-Id: I58aeedcf327ce717d615c309b4d5b4a05c36c51c
m7ul: consolidate device proprietary files under m7-gsm

Change-Id: I2910b5f13acf82d0c78110f3a97102aa75b72ee6
m7ul: remove GSM APN list

Change-Id: I3f9b41c73c8ad0664714f65df50ac34e74680e00