imx_watchdog: do not soft-reset while watchdog init

Currently the driver clears WCR_SRS bit when enabling
the watchdog and this causes a software reset. Do not
clear WCR_SRS.

Signed-off-by: Anatolij Gustschin <agust@denx.de>

drivers/watchdog/imx_watchdog.c

@@ -19,6 +19,7 @@ struct watchdog_regs {
 #define WCR_WDBG	0x02
 #define WCR_WDE		0x04	/* WDOG enable */
 #define WCR_WDT		0x08
+#define WCR_SRS		0x10
 #define WCR_WDW		0x80
 #define SET_WCR_WT(x)	(x << 8)
 
@@ -45,7 +46,7 @@ void hw_watchdog_init(void)
 #define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000
 #endif
 	timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1;
-	writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT |
+	writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS |
 		WCR_WDW | SET_WCR_WT(timeout), &wdog->wcr);
 	hw_watchdog_reset();
 }