watchdog: sb_wdog: Make sbwdog_set and sbwdog_pet static

Fix sparse warning:

drivers/watchdog/sb_wdog.c:70:6: warning: symbol 'sbwdog_set' was not declared. Should it be static?
drivers/watchdog/sb_wdog.c:84:6: warning: symbol 'sbwdog_pet' was not declared. Should it be static?
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Mukesh Ojha <mojha@codeaurora.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/sb_wdog.c

@@ -67,7 +67,7 @@ static DEFINE_SPINLOCK(sbwd_lock);
  *
  * wdog is the iomem address of the cfg register
  */
-void sbwdog_set(char __iomem *wdog, unsigned long t)
+static void sbwdog_set(char __iomem *wdog, unsigned long t)
 {
 	spin_lock(&sbwd_lock);
 	__raw_writeb(0, wdog);
@@ -81,7 +81,7 @@ void sbwdog_set(char __iomem *wdog, unsigned long t)
  *
  * wdog is the iomem address of the cfg register
  */
-void sbwdog_pet(char __iomem *wdog)
+static void sbwdog_pet(char __iomem *wdog)
 {
 	spin_lock(&sbwd_lock);
 	__raw_writeb(__raw_readb(wdog) | 1, wdog);