pinctrl: add include guard to pinctrl-state.h

Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

include/linux/pinctrl/pinctrl-state.h

···
  * Standard pin control state definitions
  */
 
+#ifndef __LINUX_PINCTRL_PINCTRL_STATE_H
+#define __LINUX_PINCTRL_PINCTRL_STATE_H
+
 /**
  * @PINCTRL_STATE_DEFAULT: the state the pinctrl handle shall be put
  *	into as default, usually this means the pins are up and ready to
···
 #define PINCTRL_STATE_INIT "init"
 #define PINCTRL_STATE_IDLE "idle"
 #define PINCTRL_STATE_SLEEP "sleep"
+
+#endif /* __LINUX_PINCTRL_PINCTRL_STATE_H */