ARM: imx: Add support for the Armadeus Systems APF27Dev docking board

The APF27Dev is a docking board for an APF27 SOM

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@armadeus.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>