sepolicy: allow userinit to set its property

Change-Id: I9d8270d889566d169077a1b1fdaee43059d11ee1
diff --git a/sepolicy/property.te b/sepolicy/property.te
index fe7d9b2..1e6b220 100644
--- a/sepolicy/property.te
+++ b/sepolicy/property.te
@@ -1,2 +1,3 @@
 type adbtcp_prop, property_type;
 type recovery_prop, property_type;
+type userinit_prop, property_type;