Allow RingtonePickerActivity to be disabled

Bug: 62996582
Test: verify activity is disabled on devices with value set to false
Change-Id: I23ca9c5efe373c35ad162ca2e7f9248ebe0b4a5d
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 1ea883a..c38ea61 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -85,6 +85,7 @@
 
         <activity android:name="RingtonePickerActivity"
                 android:theme="@style/PickerDialogTheme"
+                android:enabled="@*android:bool/config_defaultRingtonePickerEnabled"
                 android:excludeFromRecents="true">
             <intent-filter>
                 <action android:name="android.intent.action.RINGTONE_PICKER" />