watchdog: apple: Actually flush writes after requesting watchdog restart

Although there is an existing code comment about flushing the writes,
writes were not actually being flushed.

Actually flush the writes by changing readl_relaxed() to readl().

Fixes: 4ed224a ("watchdog: Add Apple SoC watchdog driver")
Suggested-by: Arnd Bergmann <[email protected]>
Signed-off-by: Nick Chan <[email protected]>
Reviewed-by: Guenter Roeck  <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: asdfugil

drivers/watchdog/apple_wdt.c

@@ -130,7 +130,7 @@ static int apple_wdt_restart(struct watchdog_device *wdd, unsigned long mode,
 	 * can take up to ~20-25ms until the SoC is actually reset. Just wait
 	 * 50ms here to be safe.
 	 */
-	(void)readl_relaxed(wdt->regs + APPLE_WDT_WD1_CUR_TIME);
+	(void)readl(wdt->regs + APPLE_WDT_WD1_CUR_TIME);
 	mdelay(50);
 
 	return 0;