pinctrl/gpio: Unify namespace for cross-calls

The pinctrl_request_gpio() and pinctrl_free_gpio() break the nice
namespacing in the other cross-calls like pinctrl_gpio_foo().
Just rename them and all references so we have one namespace
with all cross-calls under pinctrl_gpio_*().

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 1f08715..43b5104 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -249,7 +249,7 @@ static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
 	if (error < 0)
 		return error;
 
-	error = pinctrl_request_gpio(chip->base + offset);
+	error = pinctrl_gpio_request(chip->base + offset);
 	if (error)
 		pm_runtime_put(&p->pdev->dev);
 
@@ -260,7 +260,7 @@ static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset)
 {
 	struct gpio_rcar_priv *p = gpiochip_get_data(chip);
 
-	pinctrl_free_gpio(chip->base + offset);
+	pinctrl_gpio_free(chip->base + offset);
 
 	/*
 	 * Set the GPIO as an input to ensure that the next GPIO request won't