Adds a "contains" relationship that relates the root file system package
to the files contained in it. If a package provides a file with a
matching hash and path, it will be linked, otherwise a new File element
will be created
(From OE-Core rev: e6fe754aef93e834e5226c8b13fdf75e03080ba2)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>