mach-kirkwood has been removed, now that kirkwood lives in
mach-mvebu. Remove ARCH_KIRKWOOD since ARCH_MVEBU is sufficient.
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Acked-by: NJason Cooper <jason@lakedaemon.net>
Signed-off-by: NMark Brown <broonie@linaro.org>