cns3xxx: correct size specifier in watchdog init print

fix compiler warnings

Fixes: 84acff2865 ("cns3xxx: fix mpcore watchdog")
Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

target/linux/cns3xxx/patches-4.14/020-watchdog_support.patch

@@ -117,7 +117,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 +	struct resource *res;
 +	unsigned long rate = twd_timer_get_rate();
 +
-+	pr_info("MPCore WD init. clockrate: %u prescaler: %u countrate: %u timeout: %us\n", rate, 256, rate / 256, wdt_timeout);
++	pr_info("MPCore WD init. clockrate: %lu prescaler: %u countrate: %lu timeout: %us\n", rate, 256, rate / 256, wdt_timeout);
 +
 +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 +	if (!res)