Enabling Dialer to play ringtones

+ The code to make the Dialer play was disabled behind flags, this
change flips the flags so the Dialer is responsible for playing the
ringtone.
+ The in-code flag will be removed later after a QA pass of the
feature.
- Removed TODO to respect Do Not Disturb, see b/26936902

Bug=18702990

Change-Id: I773c1c614beb61a6763daccd2903d9d341cf4dc0
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index e7c17cb..c048854 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -317,7 +317,7 @@
                  android:encryptionAware="true" >
             <meta-data android:name="android.telecom.IN_CALL_SERVICE_UI" android:value="true" />
             <meta-data android:name="android.telecom.IN_CALL_SERVICE_RINGING"
-                android:value="false"/>
+                android:value="true"/>
             <intent-filter>
                 <action android:name="android.telecom.InCallService"/>
             </intent-filter>