pinctrl: Add third argument label for pinctrl_gpio_request() function

This change allows to use pinctrl_gpio_request() function as a direct
pointer for dm_gpio_ops's .request callback.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/include/dm/pinctrl.h b/include/dm/pinctrl.h
index 5436dc4..e3e50afe 100644
--- a/include/dm/pinctrl.h
+++ b/include/dm/pinctrl.h
@@ -611,10 +611,11 @@
  * pinctrl_gpio_request() - Request a single pin to be used as GPIO
  * @dev:	GPIO peripheral device
  * @offset:	GPIO pin offset from the GPIO controller
+ * @label:	GPIO label
  *
  * Return: 0 on success, or negative error code on failure
  */
-int pinctrl_gpio_request(struct udevice *dev, unsigned offset);
+int pinctrl_gpio_request(struct udevice *dev, unsigned offset, const char *label);
 
 /**
  * pinctrl_gpio_free() - Free a single pin used as GPIO