Add an exported flag in manifest

With b/150232615, we will need an explicit value set for the exported
flag when intent filters are present, as the default behavior is
changing for future versions. This change adds the value reflecting the previous
default to the manifest.

These changes were made using an automated tool, the xml file may be
reformatted slightly creating a larger diff. The only "real" change is
the addition of "android:exported" to activities, services, and
receivers that have one or more intent-filters.

Bug: 150232615
Test: TH
Exempt-From-Owner-Approval: mechanical refactoring
Change-Id: Ibbec2f43302b6252ee0a5faf37e83e1244375d59
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 9193c3b..71ffe31 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -45,6 +45,7 @@
 
         <!-- BroadcastReceiver that listens for incoming SMS messages -->
         <receiver android:name=".SmsReceiver"
+                  android:exported="true"
                   android:permission="android.permission.BROADCAST_SMS">
             <intent-filter>
                 <action android:name="android.provider.Telephony.SMS_DELIVER" />
@@ -54,6 +55,7 @@
 
         <!-- BroadcastReceiver that listens for incoming MMS messages -->
         <receiver android:name=".MmsReceiver"
+                  android:exported="true"
                   android:permission="android.permission.BROADCAST_WAP_PUSH">
             <intent-filter>
                 <action android:name="android.provider.Telephony.WAP_PUSH_DELIVER" />