set ro.bq.gpu_to_cpu_unsupported properly

Change-Id: Ia4b9433fc9b31d23859b7a3b24e0a42fb81b2441
diff --git a/system.prop b/system.prop
index a8df17e..77bc0b9 100644
--- a/system.prop
+++ b/system.prop
@@ -8,3 +8,6 @@
 
 # Ril sends only one RIL_UNSOL_CALL_RING, so set call_ring.multiple to false
 ro.telephony.call_ring.multiple=0
+
+# GPU producer to CPU consumer not supported
+ro.bq.gpu_to_cpu_unsupported=1