Add PhoneSubInfo.getCompleteVoiceMailNumber.

PhoneSubInfo.getVoiceMailNumber now returns only the network
portion of the voicemail number. Use the new method
PhoneSubInfo.getCompleteVoiceMailNumber to get the netowrk
portion and the post dial portion.

Bug: 2881483
Change-Id: I7637d4fa0ffa046b4eebc4d599719bb668c940b5
5 files changed