pinctrl: lantiq: Fix header file include guard

Define __PINCTRL_LANTIQ_H to prevent multiple inclusion.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/pinctrl-lantiq.h b/drivers/pinctrl/pinctrl-lantiq.h
index 6d07f02..c7cfad5 100644
--- a/drivers/pinctrl/pinctrl-lantiq.h
+++ b/drivers/pinctrl/pinctrl-lantiq.h
@@ -10,6 +10,7 @@
  */
 
 #ifndef __PINCTRL_LANTIQ_H
+#define __PINCTRL_LANTIQ_H
 
 #include <linux/clkdev.h>
 #include <linux/pinctrl/pinctrl.h>