AT91: Makes AT91SAM9263-EK build correctly against u-boot-atmel/master

Rework for AT91SAM9263-EK, makes it build again.
Based on the work for AT91SAM9260-EK.

Signed-off-by: Hong Xu <hong.xu@atmel.com>
Signed-off-by: Reinhard Meyer <uboot@emk-elektronik.de>
6 files changed