Add toggleLTE

Change-Id: I75ad70eeb2a9020ee662cf9286f0f612da9842b3
Add getLteOnGsmMode

Change-Id: I7e9c59163c89825906a5490decd6017aa3093a8a
Add missing CMD_TOGGLE_LTE definition

Change-Id: Ia1256c0b60f3955a2bec2a91afe69975a822904a