linux-imx

ARM: kirkwood: remove support for legacy booting of Dockstar

The Kirkwood Dockstar platform has already been converted to the
Device Tree, so we can remove the legacy booting option for this
platform.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>