ARM: 5851/1: [AT91] AT572D940HF-EK board support

Add support for the Atmel AT572D940HF-EK board (development board for
the AT572D940HF processor).

Signed-off-by: Antonio R. Costa <costa.antonior@gmail.com>
Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>