This adds documentation of device tree bindings for the
UART found on ARM MPS2 platform
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NVladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>