Allow calling of voicemail using CALL_PRIVILEGED

Bug: 18456519
Change-Id: I97bd63a726ca9bc6412266a5592696daf96e912d
Merge tag 'android-5.0.1_r1' of https://android.googlesource.com/platform/packages/services/Telecomm into lollipop

Android 5.0.1 release 1