watchdog: max6370: use __udelay() to avoid recursion

The udelay() function in lib/time.c contains a WATCHDOG_RESET()
call. So use __udelay() in max6370_wdt.c to prevent recursion.

Fixes: 0a095fc5

 ("watchdog: Add MAX6370 watchdog timer driver")
Signed-off-by: Pali Rohár <pali@kernel.org>

drivers/watchdog/max6370_wdt.c

@@ -73,7 +73,7 @@ static int max6370_wdt_reset(struct udevice *dev)
 
 	if (dm_gpio_is_valid(&wdt->gpio_wdi)) {
 		dm_gpio_set_value(&wdt->gpio_wdi, 1);
-		udelay(1);
+		__udelay(1);
 		dm_gpio_set_value(&wdt->gpio_wdi, 0);
 	} else {
 		val = readb(wdt->reg);