pinctrl: fix dangling comment

This comment was referring to an older PINMUX define, it should
be PINCTRL now.

Reported-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

include/linux/pinctrl/machine.h

@@ -163,5 +163,5 @@ static inline int pinctrl_register_mappings(struct pinctrl_map const *map,
 	return 0;
 }
 
-#endif /* !CONFIG_PINMUX */
+#endif /* !CONFIG_PINCTRL */
 #endif