Deprecate setVisualVoicemailEnabled isVisualVoicemailEnabled

The visual voicemail client is removed from telephony service. There
are no longer code to handle these methods. These methods are only
used by dialer during NMR1.

Bug: 36173451
Fixes: 36173451

Test: smoke test dialer visual voicemail operations.
Change-Id: I82a35026821b4c4d98420e5bfcecff78b2163822