Put stricter flag checks

Also removed a log which gives away flag.

Bug: 312976400
Test: manual
Change-Id: I4a989de8b6b920666aabf0cc9311e28becc4d862

src/com/android/settings/privatespace/HidePrivateSpaceController.java

@@ -38,7 +38,7 @@ public class HidePrivateSpaceController extends TogglePreferenceController {
     @Override
     @AvailabilityStatus
     public int getAvailabilityStatus() {
-        return AVAILABLE;
+        return android.os.Flags.allowPrivateProfile() ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
     }
 
     @Override