SF: add render rate to the refresh rate overlay

Test: Enable refresh rate overlay
Bug: 257072060
Change-Id: I7c81bdff7ed10beb7487b930448f8c5dc7770073
diff --git a/services/surfaceflinger/Scheduler/RefreshRateSelector.h b/services/surfaceflinger/Scheduler/RefreshRateSelector.h
index 1ed16c6..4f5842a 100644
--- a/services/surfaceflinger/Scheduler/RefreshRateSelector.h
+++ b/services/surfaceflinger/Scheduler/RefreshRateSelector.h
@@ -240,8 +240,9 @@
         return {mMinRefreshRateModeIt->second->getFps(), mMaxRefreshRateModeIt->second->getFps()};
     }
 
-    std::optional<Fps> onKernelTimerChanged(std::optional<DisplayModeId> desiredActiveModeId,
-                                            bool timerExpired) const EXCLUDES(mLock);
+    ftl::Optional<FrameRateMode> onKernelTimerChanged(
+            std::optional<DisplayModeId> desiredActiveModeId, bool timerExpired) const
+            EXCLUDES(mLock);
 
     void setActiveMode(DisplayModeId, Fps renderFrameRate) EXCLUDES(mLock);