autoconf: consolidate DEPENDS
Depending on nativesdk- varients in a nativesdk build isn't correct, so
just collapse the DEPENDS down and let bitbake do the right thing (which
is leaving them as -native).
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>