overlay: Set default AOSP app providers

This commit sets AOSP dialer and Messaging as the default apps and allows MediaProvider to use its ringtone picker activity.

Change-Id: I1c5f692a2b144b0819c076ab4e4268a206d55f33
diff --git a/overlay/common/frameworks/base/core/res/res/values/config.xml b/overlay/common/frameworks/base/core/res/res/values/config.xml
index a56f122..b38d060 100644
--- a/overlay/common/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/common/frameworks/base/core/res/res/values/config.xml
@@ -25,6 +25,18 @@
         <item>org.microg.nlp</item>
     </string-array>
 
+    <!-- Default SMS Application. This will be the default SMS application when
+         the phone first boots. The user can then change the default app to one
+         of their choosing.
+         This can be overridden for devices where a different default SMS
+         application is desired.
+         If this string is empty or the specified package does not exist, then
+         the platform will search for an SMS app and use that (if there is one)-->
+    <string name="config_defaultSms" translatable="false">com.android.messaging</string>
+
+    <!-- The name of the package that will hold the dialer role by default. -->
+    <string name="config_defaultDialer" translatable="false">com.android.dialer</string>
+
     <bool name="config_cellBroadcastAppLinks">true</bool>
 
     <!-- Disable stock OTA components if installed -->