Fakeroot workers usually have dependencies that need to be ready before they
can be started. Starting them as a block therefore doesn't work as the
dependencies may or may not have been built. Therefore start the multiconfig
fakeworkers individually upon demand.
[YOCTO #10344]
(Bitbake rev: ac5ea74152b011256209c8b5664216f290b123e8)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>