Enable MtpDocumentsProvider by default.

BUG=20274999

Change-Id: I35941df66fea4ab703f8f1de3c69b6f4dd2be9a0
diff --git a/packages/MtpDocumentsProvider/AndroidManifest.xml b/packages/MtpDocumentsProvider/AndroidManifest.xml
index 3861d78..4a89cbb 100644
--- a/packages/MtpDocumentsProvider/AndroidManifest.xml
+++ b/packages/MtpDocumentsProvider/AndroidManifest.xml
@@ -9,8 +9,7 @@
             android:authorities="com.android.mtp.documents"
             android:grantUriPermissions="true"
             android:exported="true"
-            android:permission="android.permission.MANAGE_DOCUMENTS"
-            android:enabled="false">
+            android:permission="android.permission.MANAGE_DOCUMENTS">
             <intent-filter>
                 <action android:name="android.content.action.DOCUMENTS_PROVIDER" />
             </intent-filter>