Remove dead method from TelephonyManager

TelephonyManager.getCompleteVoiceMailNumber &
TelephonyManager.getCompleteVoiceMailNumberForSubscriber have no
reference after lollipop. It's a good time to remove the dead code.

Test: no test
Bug: 78788614
Change-Id: I99091dd9a47f2b5aeca3d320e873b7b7c2baf36f
2 files changed