ARM: dts: imx53: Add support for imx53 HSC/DDC boards from K+P

This commit provides support for HSC and DDC boards from
Kieback&Peter GmbH vendor.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>