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/gpiolib.c b/drivers/gpio/gpiolib.c
index eb80dac..a9cb825 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1859,7 +1859,7 @@ static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
  */
 int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset)
 {
-	return pinctrl_request_gpio(chip->gpiodev->base + offset);
+	return pinctrl_gpio_request(chip->gpiodev->base + offset);
 }
 EXPORT_SYMBOL_GPL(gpiochip_generic_request);
 
@@ -1870,7 +1870,7 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_request);
  */
 void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset)
 {
-	pinctrl_free_gpio(chip->gpiodev->base + offset);
+	pinctrl_gpio_free(chip->gpiodev->base + offset);
 }
 EXPORT_SYMBOL_GPL(gpiochip_generic_free);