sapphire: add props for variable refresh rate

configs/properties/vendor.prop

@@ -227,6 +227,11 @@ vendor.display.use_smooth_motion=1
 vendor.display.vds_allow_hwc=0
 vendor.gralloc.disable_ubwc=0
 vendor.gralloc.secure_preview_buffer_format=420_sp
+debug.sf.frame_rate_multiple_threshold=60
+ro.surface_flinger.use_content_detection_for_refresh_rate=true
+ro.surface_flinger.set_display_power_timer_ms=1000
+ro.surface_flinger.set_idle_timer_ms=80
+ro.surface_flinger.set_touch_timer_ms=200
 debug.hwui.renderer=skiagl
 debug.renderengine.backend=skiaglthreaded
 renderthread.skia.reduceopstasksplitting=true