Remove voicemail/impl/TelephonyMangerCompat

These reflection calls are used for the transition period when amending VVM APIs in O. The public version should be used now.

TEST=TAP
Bug: 77334965
Test: TAP
PiperOrigin-RevId: 193095281
Change-Id: Ifaf2e78f007a155221146b40369aaed66d4325c6
3 files changed