watchdog: imx2_wdt: Use register definition in regmap_write()

In order to improve readability it is better to pass the register name
definition rather than to pass its hardcoded offset.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

drivers/watchdog/imx2_wdt.c

@@ -91,7 +91,7 @@ static int imx2_restart_handler(struct notifier_block *this, unsigned long mode,
 						    struct imx2_wdt_device,
 						    restart_handler);
 	/* Assert SRS signal */
-	regmap_write(wdev->regmap, 0, wcr_enable);
+	regmap_write(wdev->regmap, IMX2_WDT_WCR, wcr_enable);
 	/*
 	 * Due to imx6q errata ERR004346 (WDOG: WDOG SRS bit requires to be
 	 * written twice), we add another two writes to ensure there must be at
@@ -99,8 +99,8 @@ static int imx2_restart_handler(struct notifier_block *this, unsigned long mode,
 	 * the target check here, since the writes shouldn't be a huge burden
 	 * for other platforms.
 	 */
-	regmap_write(wdev->regmap, 0, wcr_enable);
-	regmap_write(wdev->regmap, 0, wcr_enable);
+	regmap_write(wdev->regmap, IMX2_WDT_WCR, wcr_enable);
+	regmap_write(wdev->regmap, IMX2_WDT_WCR, wcr_enable);
 
 	/* wait for reset to assert... */
 	mdelay(500);