kernel: add missing softdog symbol

Signed-off-by: John Crispin <john@phrozen.org>

package/kernel/linux/modules/other.mk

@@ -411,7 +411,8 @@ $(eval $(call KernelPackage,rfkill))
 define KernelPackage/softdog
   SUBMENU:=$(OTHER_MENU)
   TITLE:=Software watchdog driver
-  KCONFIG:=CONFIG_SOFT_WATCHDOG
+  KCONFIG:=CONFIG_SOFT_WATCHDOG \
+  	CONFIG_SOFT_WATCHDOG_PRETIMEOUT=n
   FILES:=$(LINUX_DIR)/drivers/$(WATCHDOG_DIR)/softdog.ko
   AUTOLOAD:=$(call AutoLoad,50,softdog,1)
 endef