m7-common: Introduce m7vzw

Change-Id: Iff184007a7906f3fe842f0038c016974034e9217
Merge "m7-common: Introduce m7vzw" into cm-10.2
m7-common: clean up initscripts

* m7spr has it's own set, while m7vzw shares the GSM set
* Fixes compilation for non-m7vzw variants

Change-Id: I53f877d132d8ce2c15144ff12f82232fae883c4f
Merge remote-tracking branch 'upstream/cm-10.2' into cm-10.2