raviole: fix $(ro.hardware) not works in "on property:"

use ro.vendor.factory to replace ro.build.flavor

Bug: 187391068
Change-Id: I85f880bd4ada673655afd91cd092dbd2f1f0fec3
diff --git a/conf/init.raviole.rc b/conf/init.raviole.rc
index 4541760..79cd899 100644
--- a/conf/init.raviole.rc
+++ b/conf/init.raviole.rc
@@ -1,6 +1,6 @@
 # Raven/Oriole specific init.rc
 
-on init && property:ro.build.flavor=factory_${ro.hardware}-userdebug
+on init && property:ro.vendor.factory=1
     import /vendor/etc/init/hw/init.factory.rc
 
 on early-boot