Add Contec Micro9-Slim support

Cc: Ryan Mallon <ryan@bluewatersys.com>

Requires: 5750/1
Signed-off-by: NHubert Feurstein <hubert.feurstein@contec.at>
Acked-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>