ARM: configs: at91: enable sama5d4 compatible watchdog

Enable CONFIG_SAMA5D4_WATCHDOG. This driver is compatible with sam9x60
watchdog timer block.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Link: https://lore.kernel.org/r/1581408369-14469-3-git-send-email-eugen.hristev@microchip.com


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>