mfd: max77693: Add haptic of_compatible in mfd_cell

This patch add haptic of_compatible in order to use the haptic
device driver using Devicetree.

Signed-off-by: Jaewon Kim <[e-mail]>
Acked-by: Chanwoo Choi <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/max77693.c

···
 	{ .name = "max77693-pmic", },
 	{ .name = "max77693-charger", },
 	{ .name = "max77693-muic", },
-	{ .name = "max77693-haptic", },
+	{
+		.name = "max77693-haptic",
+		.of_compatible = "maxim,max77693-haptic",
+	},
 	{
 		.name = "max77693-flash",
 		.of_compatible = "maxim,max77693-flash",