Update OWNERS for WorkDuration.java

Bug: 323969988
Test: manual
Change-Id: If662b1527de2e6e98189c1cf6eb308dd0c40399d

core/java/android/os/OWNERS

@@ -83,6 +83,7 @@ per-file ArtModuleServiceManager.java = file:platform/art:/OWNERS
 
 # PerformanceHintManager
 per-file PerformanceHintManager.java = file:/ADPF_OWNERS
+per-file WorkDuration.java = file:/ADPF_OWNERS
 
 # IThermal interfaces
 per-file IThermal* = file:/THERMAL_OWNERS