Add CheckFlagsRule to tests with `@RequiresFlags[Enabled|Disabled]`

To enable Global lint CheckFlagsRuleDetector, we need to first fix
(or baseline) all existing errors.

For context on the development of this new lint, see b/430031210.

Bug: 435371380
Test: m .
Flag: EXEMPT test change
Change-Id: I60df21a38ee69fa4d9e36774b9862ac7663ff8e1
diff --git a/services/tests/displayservicetests/src/com/android/server/display/DisplayDeviceConfigTest.java b/services/tests/displayservicetests/src/com/android/server/display/DisplayDeviceConfigTest.java
index 2ec2728..6281429 100644
--- a/services/tests/displayservicetests/src/com/android/server/display/DisplayDeviceConfigTest.java
+++ b/services/tests/displayservicetests/src/com/android/server/display/DisplayDeviceConfigTest.java
@@ -45,6 +45,8 @@
 import android.os.PowerManager;
 import android.os.Temperature;
 import android.platform.test.annotations.RequiresFlagsEnabled;
+import android.platform.test.flag.junit.CheckFlagsRule;
+import android.platform.test.flag.junit.DeviceFlagsValueProvider;
 import android.provider.Settings;
 import android.util.SparseArray;
 import android.util.Spline;
@@ -65,6 +67,7 @@
 import com.android.server.display.feature.flags.Flags;
 
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
@@ -100,6 +103,10 @@
     private DisplayDeviceConfig mDisplayDeviceConfig;
     private static final float ZERO_DELTA = 0.0f;
     private static final float SMALL_DELTA = 0.0001f;
+
+    @Rule
+    public final CheckFlagsRule mCheckFlagsRule = DeviceFlagsValueProvider.createCheckFlagsRule();
+
     @Mock
     private Context mContext;