Revert "m7ul: remove GSM APN list"

This reverts commit 34c6a484ad0a35940e7b7498662ac93494440d41.

Change-Id: Id7f88ec4545be898b9b3e328fc0bcaf20b5e35d5
Merge "Revert "m7ul: remove GSM APN list"" into kk4.4