Remove VoicemailProvider.

Its code was merged with ContactsProvider.

Bug: 5290063
Change-Id: I0cef43fe14a22f85bc77f7937e5fdbeffcd7f95b
diff --git a/target/product/core.mk b/target/product/core.mk
index b5a4b01..ef34eee 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -42,7 +42,6 @@
     TelephonyProvider \
     TtsService \
     UserDictionaryProvider \
-    VoicemailProvider \
     VpnServices \
     apache-xml \
     bluetooth-health \