Enterprice privacy: let the user know if admin enabled backups.

Bug: 73750212
Bug: 64012357
Test: make RunSettingsGoogleRoboTests

Change-Id: I586eaccaebb89a8b3e5b4014b3d6427ab2eb15a9

src/com/android/settings/enterprise/EnterprisePrivacyFeatureProviderImpl.java

@@ -235,6 +235,11 @@ public class EnterprisePrivacyFeatureProviderImpl implements EnterprisePrivacyFe
         return activeAdmins;
     }
 
+    @Override
+    public boolean areBackupsMandatory() {
+        return null != mDpm.getMandatoryBackupTransport();
+    }
+
     protected static class EnterprisePrivacySpan extends ClickableSpan {
         private final Context mContext;