Attach vendor_property_type to properties

We are going to enforce that each property has an explicit owner, such
as system, vendor, or product. This attaches vendor_property_type to
properties defined under vendor sepolicy directories.

Bug: 159097992
Test: lunch hikey960-userdebug; m selinux_policy
Change-Id: If3e53dff7731d9560bdc637bb8f6067bdeadec15
diff --git a/sepolicy/property.te b/sepolicy/property.te
index 93e029d..c47a33e 100644
--- a/sepolicy/property.te
+++ b/sepolicy/property.te
@@ -1 +1 @@
-type sensors_prop, property_type;
+vendor_internal_prop(sensors_prop)