The barebox version of the kwboot tool has evolved a bit. To support
Armada XP and Dove. Additionally a few minor fixes have been applied.
So lets sync with the latest barebox version.

Please note that the main difference between both versions now is, that
the U-Boot version still supports the -p option, to dynamically patch
an image for UART boot mode. I didn't test it now though.
Signed-off-by: NStefan Roese <sr@denx.de>
Tested-by: NLuka Perkov <luka@openwrt.org>

The kwboot program boots boards based on Marvell's Kirkwood platform
via Xmodem over their integrated UART.
Signed-off-by: NDaniel Stodden <daniel.stodden@googlemail.com>
Acked-by: NLuka Perkov <uboot@lukaperkov.net>
Tested-By: NHolger Brunck <holger.brunck@keymile.com>
Tested-By: NDavid Purdy <david.c.purdy@gmail.com>
Tested-by: NSimon Guinot <simon.guinot@sequanux.org>