Revert "gril: follow struct size change in data call list"
Created by: UniversalSuperBox
Reverts ubports/ofono#6, fixes https://github.com/ubports/ubuntu-touch/issues/1310
This merge caused issues with our Android 4.4 devices, repeatedly failing to activate their APNs: https://paste.ubuntu.com/p/qPQ2Qfw7cS/