gpio: Add missing devm_gpio_ wrapper in devres.txt

Add following missing devm wrappers in file devrs.txt under
list of managed interfaces.
  devm_gpio_request()
  devm_gpio_request_one()
  devm_gpio_free()

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>

Documentation/driver-model/devres.txt

@@ -254,6 +254,9 @@ GPIO
   devm_gpiod_put()
   devm_gpiochip_add_data()
   devm_gpiochip_remove()
+  devm_gpio_request()
+  devm_gpio_request_one()
+  devm_gpio_free()
 
 IIO
   devm_iio_device_alloc()