mfd: as3722: Add watchdog support

Add watchdog device support for as3722

Signed-off-by: Bibek Basu <bbasu@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/as3722.c b/drivers/mfd/as3722.c
index 2d9b728..c71ff0a 100644
--- a/drivers/mfd/as3722.c
+++ b/drivers/mfd/as3722.c
@@ -74,6 +74,9 @@
 	{
 		.name = "as3722-power-off",
 	},
+	{
+		.name = "as3722-wdt",
+	},
 };
 
 static const struct regmap_irq as3722_irqs[] = {