Make the Carrier Key Download Alarm intent protected

Test: telephony tests
Bug: 174494033
Change-Id: I4d45a9fa5c6a5d808804602d5d67a783636799b7
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 08facfe..2aee527 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -38,6 +38,7 @@
     <protected-broadcast android:name="android.intent.action.ACTION_MDN_STATE_CHANGED" />
     <protected-broadcast android:name="android.telephony.action.SERVICE_PROVIDERS_UPDATED" />
     <protected-broadcast android:name="android.provider.Telephony.SIM_FULL" />
+    <protected-broadcast android:name="com.android.internal.telephony.carrier_key_download_alarm" />
     <protected-broadcast android:name="com.android.internal.telephony.data-restart-trysetup" />
     <protected-broadcast android:name="com.android.internal.telephony.data-stall" />
     <protected-broadcast android:name="com.android.internal.telephony.provisioning_apn_alarm" />