[WATCHDOG] removed unused #include <version.h>

The drivers below do not use LINUX_VERSION_CODE nor KERNEL_VERSION.
  drivers/watchdog/pc87413_wdt.c

This patch removes the said #include <version.h>.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/pc87413_wdt.c

@@ -30,7 +30,6 @@
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/moduleparam.h>
-#include <linux/version.h>
 #include <linux/io.h>
 #include <linux/uaccess.h>