Drive-by fix: crash when not DO/PO.

Currently loadEnrollmentSpedificId() throws SecurityException

Bug: 187808221
Test: manual
Change-Id: I7671f6a974dfc04a9773b0d1714a635f2cb4d43d

Author: Pavel Grafov

app/src/main/java/com/afwsamples/testdpc/policy/PolicyManagementFragment.java

@@ -2496,6 +2496,10 @@ private void loadSecurityPatch() {
     @TargetApi(VERSION_CODES.S)
     private void loadEnrollmentSpecificId() {
         Preference enrollmentSpecificIdPreference = findPreference(ENROLLMENT_SPECIFIC_ID_KEY);
+        if (!enrollmentSpecificIdPreference.isEnabled()) {
+            return;
+        }
+
         String esid = "";
         try {
             //TODO: Call directly when the S SDK is available.

app/src/main/res/xml/device_policy_header.xml

@@ -32,7 +32,8 @@
         android:key="enrollment_specific_id"
         android:selectable="false"
         android:title="@string/enrollment_specific_id"
-        testdpc:admin="any"
+        testdpc:admin="deviceOwner|profileOwner"
+        testdpc:delegation="delegation-cert-install"
         testdpc:minSdkVersion="S" />
 
     <PreferenceCategory android:title="@string/accessibility_title">