SF: Forward declare RefreshRateConfigs in SurfaceFlingerFactory.h

There was an error including SurfaceFlingerFactory.h from code that
should not care about the scheduler.

Test: atest libsurfaceflinger_unittest libcompositionengine_test
Test: go/wm-smoke
Bug: 121291683
Change-Id: I1bb618b4926de4748d06dcae75618a4f079cabcd
diff --git a/services/surfaceflinger/SurfaceFlingerFactory.h b/services/surfaceflinger/SurfaceFlingerFactory.h
index 4f303a3..3fd4de8 100644
--- a/services/surfaceflinger/SurfaceFlingerFactory.h
+++ b/services/surfaceflinger/SurfaceFlingerFactory.h
@@ -54,7 +54,9 @@
 
 namespace scheduler {
 class PhaseOffsets;
+class RefreshRateConfigs;
 } // namespace scheduler
+
 namespace surfaceflinger {
 
 class NativeWindowSurface;