SurfaceFlinger: cleanup conversion issues in Scheduler

Bug: 129481165
Test: adb shell /data/nativetest64/libsurfaceflinger_unittest/libsurfaceflinger_unittest
Change-Id: Iff995777bd4b8e4f734b995373c8b332192d8d84
diff --git a/services/surfaceflinger/Scheduler/SchedulerUtils.h b/services/surfaceflinger/Scheduler/SchedulerUtils.h
index e7e73a3..04a4cd1 100644
--- a/services/surfaceflinger/Scheduler/SchedulerUtils.h
+++ b/services/surfaceflinger/Scheduler/SchedulerUtils.h
@@ -78,6 +78,11 @@
 
 static constexpr size_t max64print = std::numeric_limits<nsecs_t>::digits10 + 1;
 
+template <typename T>
+static inline T round(float f) {
+    return static_cast<T>(std::round(f));
+}
+
 } // namespace android::scheduler
 
 namespace std {