Allow CBR when device owners is set up

Bug: 169758206
Test: manual
Change-Id: I98ac9eecd8a497541d9ce0761920db1252eb72e0
Merged-In: I98ac9eecd8a497541d9ce0761920db1252eb72e0
(cherry picked from commit 2268caf)

Author: Jordan Liu

core/res/res/values/required_apps_managed_device.xml

@@ -27,5 +27,6 @@
         <item>com.android.providers.downloads</item>
         <item>com.android.providers.downloads.ui</item>
         <item>com.android.documentsui</item>
+        <item>com.android.cellbroadcastreceiver</item>
     </string-array>
 </resources>