uboot-imx

atmel: Bring in at91 pio4 device tree file and bindings

Bring in required device tree file and bindings from Linux.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
Reviewed-by: Simon Glass <sjg@chromium.org>