Fix VVM playback control buttons don’t support TALKBACK

Change-Id: Ie1f81a4eaacc85bcab6fd3b32f081e83a4c36467
Signed-off-by: HUANG Menghuai <menghuai.huang@orange.com>
Add a content observer for voicemail to the call log fragment

The voicemail status message was not updated with new voicemail status.

Change-Id: I3430bb5c21d8b25c863ca1e74f48774012c961c8
Signed-off-by: HUANG Menghuai <menghuai.huang@orange.com>