Implement toggleLte

Using logic based on Ryan Hope's commits

Change-Id: I2bab17ecda3454fc1d405172c21005497ea8fa1b
Telephony: Cleanup CAF additions

Change-Id: I87d334ce3f72c55ae71a7ab5adce7c7d2cb769e1
Merge "Telephony: Cleanup CAF additions" into cm-11.0
Merge "Implement toggleLte" into cm-11.0