watchdog: da9062: remove unused code

The patch "watchdog: da9062: use protection delay mechanism from core"
(fb484262) removed the only user of j_time_stamp. This turned into some
leftover functions that are removed with this patch.
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
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/da9062_wdt.c

@@ -30,14 +30,8 @@ static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
 struct da9062_watchdog {
 	struct da9062 *hw;
 	struct watchdog_device wdtdev;
-	unsigned long j_time_stamp;
 };
 
-static void da9062_set_window_start(struct da9062_watchdog *wdt)
-{
-	wdt->j_time_stamp = jiffies;
-}
-
 static unsigned int da9062_wdt_timeout_to_sel(unsigned int secs)
 {
 	unsigned int i;
@@ -59,8 +53,6 @@ static int da9062_reset_watchdog_timer(struct da9062_watchdog *wdt)
 			   DA9062AA_WATCHDOG_MASK,
 			   DA9062AA_WATCHDOG_MASK);
 
-	da9062_set_window_start(wdt);
-
 	return ret;
 }
 
@@ -232,8 +224,6 @@ static int da9062_wdt_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	da9062_set_window_start(wdt);
-
 	return da9062_wdt_ping(&wdt->wdtdev);
 }