We can't build this combination right now because of a circular dependency,
but it's good to make it explicit.
(From OE-Core rev: 736be249c56fd9a603dbb8ece77612928bb25ce9)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>