gpio: eic-sprd: 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>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-eic-sprd.c

@@ -653,7 +653,6 @@ static int sprd_eic_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, sprd_eic);
 	return 0;
 }