Upgrade TestDPC SDK to R

Bug: 152203329
Test: ./gradlew assemble
Change-Id: I28fa76e3ff2d54e9daf739f2c4205a4c18bc4989

Author: Rubin Xu

app/build.gradle

@@ -13,7 +13,7 @@ ext {
 }
 
 android {
-    compileSdkVersion 'android-29'
+    compileSdkVersion 'android-R'
     buildToolsVersion "28.0.0"
 
     defaultConfig {

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

@@ -2575,15 +2575,8 @@ private void reloadEnableBackupServiceUi() {
     //@TargetApi(VERSION_CODES.R)
     private void reloadCommonCriteriaModeUi() {
         if (mCommonCriteriaModePreference.isEnabled()) {
-            try {
-                mCommonCriteriaModePreference.setChecked(
-                    (Boolean) ReflectionUtil.invoke(mDevicePolicyManager,
-                    "isCommonCriteriaModeEnabled",
-                        new Class<?>[]{ComponentName.class},
-                    mAdminComponentName));
-            } catch (ReflectionIsTemporaryException e) {
-                Log.e(TAG, "Error invoking isCommonCriteriaModeEnabled", e);
-            }
+            mCommonCriteriaModePreference.setChecked(
+                mDevicePolicyManager.isCommonCriteriaModeEnabled(mAdminComponentName));
         }
     }