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: ab15486c636e451ed5a62e561980946887901c3b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>