When the caller doesn't specify a pkgs list we want to generate the tree of
all available packages. To do so use the new universe target list.
(Bitbake rev: 26b0c538ad4f677e0d45a66484c2dca073459282)
Signed-off-by: Joshua Lock <josh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>