ARM: imx: udoo_neo: Enable OF_CONTROL and DM gpio/pin control

Enable OF_CONTROL and DM for gpio and pin control support
on the i.MX6SX based Udoo Neo.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Francesco Montefoschi <francesco.montefoschi@udoo.org>
Cc: Breno Lima <breno.lima@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>