gpio: bcm-kona: remove unneeded platform_set_drvdata() call

The platform_set_drvdata() call was never used, ever since the driver was
originally added.
It looks like this copy+paste left-over. Possibly the author copied from a
driver that had this line, but also had a remove hook.
Reviewed-by: Alexandru Ardelean <alex@shruggie.ro>
Signed-off-by: Andrei Coardos <aboutphysycs@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-bcm-kona.c

@@ -592,7 +592,6 @@ static int bcm_kona_gpio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	kona_gpio->pdev = pdev;
-	platform_set_drvdata(pdev, kona_gpio);
 	chip->parent = dev;
 	chip->ngpio = kona_gpio->num_bank * GPIO_PER_BANK;