watchdog: ie6xx_wdt needs io.h

Fix build error by including <linux/io.h>:

drivers/watchdog/ie6xx_wdt.c:97:2: error: implicit declaration of function 'outb'
drivers/watchdog/ie6xx_wdt.c:133:2: error: implicit declaration of function 'outl'
drivers/watchdog/ie6xx_wdt.c:161:2: error: implicit declaration of function 'inb'
drivers/watchdog/ie6xx_wdt.c:199:3: error: implicit declaration of function 'inl'
drivers/watchdog/ie6xx_wdt.c:203:3: error: implicit declaration of function 'inw'

Signed-off-by: Randy Dunlap <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/ie6xx_wdt.c

···
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/platform_device.h>
+#include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/watchdog.h>