ARM: mvebu: Enable Armada 375 watchdog in the devicetree

Add the DT nodes to enable the watchdog support available on
Armada 375 SoC.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Link: https://lkml.kernel.org/r/1397481813-4962-8-git-send-email-ezequiel.garcia@free-electrons.com


Signed-off-by: Jason Cooper <jason@lakedaemon.net>