watchdog: loongson1: Add missing MODULE_PARM_DESC

Add documentation for module_param so that they're visible with
modinfo command.

Signed-off-by: Binbin Zhou <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/loongson1_wdt.c

···
 #define DEFAULT_HEARTBEAT	30
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, bool, 0444);
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
 static unsigned int heartbeat;
-module_param(heartbeat, uint, 0444);
+module_param(heartbeat, uint, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
+		 __MODULE_STRING(DEFAULT_HEARTBEAT) ")");
 
 struct ls1x_wdt_drvdata {
 	void __iomem *base;