SurfaceFlinger: rename use_smart_90_for_video flag

Rename use_smart_90_for_video -> use_content_detection_for_refresh_rate
to better describe what it controls.

Test: Play video and observe the refresh rate
Change-Id: I5ae03073bd670d0b3bc7f2861cbf3ec0d28efbe7
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index bc4f805..19f3f98 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -108,7 +108,8 @@
         mUseContentDetectionV2(useContentDetectionV2) {
     using namespace sysprop;
 
-    if (property_get_bool("debug.sf.use_smart_90_for_video", 0) || use_smart_90_for_video(false)) {
+    if (property_get_bool("debug.sf.use_content_detection_for_refresh_rate", 0) ||
+        use_content_detection_for_refresh_rate(false)) {
         if (mUseContentDetectionV2) {
             mLayerHistory = std::make_unique<scheduler::impl::LayerHistoryV2>();
         } else {