Remove get/set of voicemail ringtone uri in shared preferences. am: fbe456f9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/33212705



Change-Id: I1509eb57990d0f766d137df48d1060c1c73041fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>