Allow the remote provisioner app to set rkp_only properties

The properties for rkp_only are no longer read only.

This allows remote provisioner unit tests to enable/disable the remote
provisioning only mode, which is required to fully verify functionality.

Test: RemoteProvisionerUnitTests
Bug: 227306369
Change-Id: I8006712a49c4d0605f6268068414b49714bbd939
diff --git a/private/property.te b/private/property.te
index ccf6040..5f565da 100644
--- a/private/property.te
+++ b/private/property.te
@@ -614,6 +614,13 @@
 neverallow domain system_and_vendor_property_type:{file property_service} *;
 
 neverallow {
+  # Only init and the remote provisioner can set the ro.remote_provisioning.* props
+  domain
+  -init
+  -remote_prov_app
+} remote_prov_prop:property_service set;
+
+neverallow {
   # Only allow init and shell to set rollback_test_prop
   domain
   -init