G-Proj: Remove gsm build.prop lines and gsm inherit

The LS970 is now using gproj-common, so gsm/cdma needs to be set in device
trees.

Change-Id: I502f335352c0a50bfab8d68712f5f3adcd274cf6
Merge "G-Proj: Remove gsm build.prop lines and gsm inherit" into cm-10.2