gpio: max77650: add MODULE_ALIAS()

Define a MODULE_ALIAS() in the gpio sub-driver for max77650 so that
the appropriate module gets loaded together with the core mfd driver.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Link: https://lore.kernel.org/r/20190703084601.9276-1-brgl@bgdev.plSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-max77650.c

@@ -188,3 +188,4 @@ module_platform_driver(max77650_gpio_driver);
 MODULE_DESCRIPTION("MAXIM 77650/77651 GPIO driver");
 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
 MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:max77650-gpio");