Mark mised call notification as protected

This CL marks the missed call notification as protected. This prevents
other apps from being able to broadcast it.

BUG: 22857261
Change-Id: I01ae992f2a5fe255f057c5aa28c5c47d34a0a093
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index a65cdb8..fabc82c 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -370,6 +370,7 @@
     <protected-broadcast android:name="android.security.STORAGE_CHANGED" />
     <protected-broadcast android:name="android.telecom.action.PHONE_ACCOUNT_REGISTERED" />
     <protected-broadcast android:name="android.telecom.action.PHONE_ACCOUNT_UNREGISTERED" />
+    <protected-broadcast android:name="android.telecom.action.SHOW_MISSED_CALLS_NOTIFICATION" />
     <protected-broadcast android:name="android.telephony.action.CARRIER_CONFIG_CHANGED" />
 
     <protected-broadcast android:name="com.android.bluetooth.btservice.action.ALARM_WAKEUP" />