watchdog: realtek-otto: add RTL9310 support

The RTL9310 SoC series has a watchdog timer identical to the already
supported SoCs. The peripheral is memory mapped at 0x18003260 and driven
by the Lexra bus clock.

Signed-off-by: Sander Vanheule <sander@svanheule.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/629e95e16c8dc812dc5a4ea34a2e2e1ff2faf88c.1656356377.git.sander@svanheule.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/realtek_otto_wdt.c

@@ -366,6 +366,7 @@ static const struct of_device_id otto_wdt_ids[] = {
 	{ .compatible = "realtek,rtl8380-wdt" },
 	{ .compatible = "realtek,rtl8390-wdt" },
 	{ .compatible = "realtek,rtl9300-wdt" },
+	{ .compatible = "realtek,rtl9310-wdt" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, otto_wdt_ids);