snowball: make the system aware that vsync is not supported

Change-Id: I62b3c6658dae4f8e0d3303a79df2c903deb69043
Signed-off-by: Vishal Bhoj <vishal.bhoj@linaro.org>
diff --git a/device.mk b/device.mk
index 18fd0a0..e4bee78 100644
--- a/device.mk
+++ b/device.mk
@@ -31,7 +31,8 @@
         sensors.snowball \
 	GPSUI
 
-PRODUCT_PROPERTY_OVERRIDES := \
+PRODUCT_PROPERTY_OVERRIDES += \
+        debug.sf.no_hw_vsync=1 \
         hwui.render_dirty_regions=false
 
 PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \