arm: remove the H2200 board

U-Boot cannot be built for h2200_defconfig with CONFIG_DM=y.

The maintainer Lukasz Dalek suggested to remove the board.
https://lists.denx.de/pipermail/u-boot/2019-August/380685.html



Cc: Lukasz Dalek <luk0104@gmail.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>