Fix: Adapt to missing flags in Android 16 QPR1 Beta 2 (#5538)

* Fix: Adapt to missing Flags in android 16 qpr1 beta 2

* fix: revert jvm memory flag

I accidentally committed it, oops

Co-authored-by: Pun Butrach <pun.butrach@gmail.com>

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Co-authored-by: Pun Butrach <pun.butrach@gmail.com>

flags/src/com/android/systemui/CustomFeatureFlags.java

@@ -321,6 +321,12 @@ public class CustomFeatureFlags implements FeatureFlags {
         return getValue(Flags.FLAG_FLOATING_MENU_RADII_ANIMATION,
                 FeatureFlags::floatingMenuRadiiAnimation);
     }
+    
+    @Override
+    public boolean generatedPreviews() {
+        return getValue(Flags.FLAG_GENERATED_PREVIEWS,
+            FeatureFlags::generatedPreviews);
+    }
 
     @Override
     public boolean getConnectedDeviceNameUnsynchronized() {