halium: import back selinux_stubs from mer-hybris

To be used for vndkservicemanager in case that comes from stock
vendor partition.

Author: NotKit

snippets/halium.xml

@@ -15,5 +15,6 @@
   <project path="vendor/halium/libhybris" name="Halium/libhybris" revision="halium-11.0" />
   <project path="vendor/halium/manifest" name="Halium/android" revision="halium-11.0" />
   <project path="vendor/halium/platform-api" name="ubports/platform-api" revision="xenial_-_android9" />
+  <project path="vendor/halium/selinux_stubs" name="mer-hybris/android_external_selinux_stubs" revision="master" />
   <project path="vendor/halium/stub_netd" name="Halium/stub_netd" revision="halium-11.0" />
 </manifest>