Allow calling of voicemail using CALL_PRIVILEGED

Bug: 18456519
Change-Id: I97bd63a726ca9bc6412266a5592696daf96e912d
telecom: fix ringtone NPE when profile is set to silent

If ringmode is set to SUPPRESS ringtone manager returns a null ringtone.
Note: to repro exception set profile to silent, then configure, click
on phone app group, and set ring mode to "off"

Change-Id: Iaa80a628d9d80f1741d5a4c736a34e0cbbe00685
Merge tag 'android-5.0.1_r1' into HEAD

Android 5.0.1 release 1