Ensure VVM receivers are exported.

See discussion in b/352459220 for more detail.  The tl;dr is that on our
internal test platforms IMPLICIT_INTENTS_ONLY_MATCH_EXPORTED_COMPONENTS
ends up being false for packages/services/Telephony so we have never seen
this particular issue.  There are new platform policies which require
receivers to be exported or no broadcasts will be sent to them.

Flag: EXEMPT bugfix; not possible to flag an attribute in a manifest.
Test: Run telephony unit tests and cts tests
Bug: 352459220
Change-Id: Ia37dd371b3a997e928e281fa2c550b9408e06843
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index b6171fc..2ea95e3 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -563,7 +563,7 @@
 
         <receiver
           android:name="com.android.phone.vvm.VvmSmsReceiver"
-            android:exported="false"
+            android:exported="true"
             androidprv:systemUserOnly="true">
             <intent-filter>
                 <action android:name="com.android.internal.provider.action.VOICEMAIL_SMS_RECEIVED"/>
@@ -572,7 +572,7 @@
 
         <receiver
             android:name="com.android.phone.vvm.VvmSimStateTracker"
-            android:exported="false"
+            android:exported="true"
             androidprv:systemUserOnly="true">
             <intent-filter>
                 <action android:name="android.intent.action.BOOT_COMPLETED"/>