msm8960: libril: support DATA_NETWORK_STATE_CHANGED_M7/5757

* This UNSOL response behaves the same as the existing
  RESPONSE_DATA_NETWORK_STATE_CHANGED.

Change-Id: I3826d9e968903a761bb4f6691fbb01fef714afc7
Merge pull request #1 from CyanogenMod/cm-10.2

msm8960: libril: support DATA_NETWORK_STATE_CHANGED_M7/5757