Make voicemail notifications working.

A recent change in voicemail content provider set the mime type to
vnd.android.cursor.item/voicemail for individual voicemail records. But
the NEW_VOICEMAIL receiver's intent filter in contacts app manifest did
not have any mimeType set. So even before the content provider change,
this only used to work for voicemails with no audio data.

Fixed the manifest file to set correct mime type.

bug: 5141120

Change-Id: I03ce4146aa0962db1f4cbc25f755797d81df0469
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 0e28ae8..d18515e 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -651,6 +651,7 @@
                 <data
                     android:scheme="content"
                     android:host="com.android.voicemail"
+                    android:mimeType="vnd.android.cursor.item/voicemail"
                 />
             </intent-filter>
             <intent-filter android:priority="100">