Explicitly export content providers

In a future version of Android, the default value for
<provider android:exported> will change from true to false.
Explicitly set android:exported="true"

Bug: 3306452
Change-Id: I95e2d73db1c7f0807358b6ccfc18f1449e4c725f
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 4e4bfa2..d77c335 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -7,6 +7,7 @@
     <application android:process="android.process.acore" android:label="@string/app_label">
 
         <provider android:name="ApplicationsProvider" android:authorities="applications"
+                android:exported="true"
                 android:syncable="false" android:multiprocess="false" />
 
         <activity android:name="ApplicationLauncher"