SF: use SurfaceFlingerProperties for frame_rate_override_global

This flag is accessed from DisplayManager in addition to SF,
so add it to SurfaceFlingerProperties instead of hardcoded flag.

Test: atest DisplayModeDirectorTests
Bug: 241447632
Change-Id: I1951bc5e17ec0f6304ecb91aa83555b8cce5e73a
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 111b927..0570c73 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2830,7 +2830,7 @@
                 return Config::FrameRateOverride::AppOverrideNativeRefreshRates;
             }
 
-            if (!base::GetBoolProperty("debug.sf.frame_rate_override_global"s, false)) {
+            if (!sysprop::frame_rate_override_global(false)) {
                 return Config::FrameRateOverride::AppOverride;
             }