hwc2: add support to enforce pipe split for built-in display

Add support to enforce pipe split when there is only one
built-in display connected when the panel fps is above 60.
This is needed to keep MDP clock down for high fps
use-cases.

Change-Id: Ie8cdd8eb45df98684d04ac8c96552fa33484d93b
CRs-Fixed: 2512607
diff --git a/include/display_properties.h b/include/display_properties.h
index a5c1378..5096591 100644
--- a/include/display_properties.h
+++ b/include/display_properties.h
@@ -128,5 +128,6 @@
 #define ENABLE_ASYNC_POWERMODE               DISPLAY_PROP("enable_async_powermode")
 #define DISABLE_UI_3D_TONEMAP                DISPLAY_PROP("disable_ui_3d_tonemap")
 #define DISABLE_PARALLEL_CACHE               DISPLAY_PROP("disable_parallel_cache")
+#define ENABLE_FORCE_SPLIT                   DISPLAY_PROP("enable_force_split")
 
 #endif  // __DISPLAY_PROPERTIES_H__