watchdog: it87_wdt: add IT8772 ID

IT8772 watchdog works as in IT872x

Tested on SHAREVDI K6-F12 board.
Signed-off-by: Hanspeter Portner <dev@open-music-kontrollers.ch>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200827105940.2835910-1-hanspeter.portner@livesystems.chSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/it87_wdt.c

@@ -15,7 +15,7 @@
  *	Support of the watchdog timers, which are available on
  *	IT8607, IT8620, IT8622, IT8625, IT8628, IT8655, IT8665, IT8686,
  *	IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726, IT8728,
- *	and IT8783.
+ *	IT8772 and IT8783.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -66,6 +66,7 @@
 #define IT8721_ID	0x8721
 #define IT8726_ID	0x8726	/* the data sheet suggest wrongly 0x8716 */
 #define IT8728_ID	0x8728
+#define IT8772_ID	0x8772
 #define IT8783_ID	0x8783
 #define IT8786_ID	0x8786
 
@@ -294,6 +295,7 @@ static int __init it87_wdt_init(void)
 	case IT8720_ID:
 	case IT8721_ID:
 	case IT8728_ID:
+	case IT8772_ID:
 	case IT8783_ID:
 	case IT8786_ID:
 		max_units = 65535;