drm/tests: helpers: Drop empty platform remove function

A remove callback just returning 0 is equivalent to no remove callback
at all. So drop the useless function.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230224221417.1712368-1-u.kleine-koenig@pengutronix.de

drivers/gpu/drm/tests/drm_kunit_helpers.c

@@ -19,14 +19,8 @@ static int fake_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int fake_remove(struct platform_device *pdev)
-{
-	return 0;
-}
-
 static struct platform_driver fake_platform_driver = {
 	.probe	= fake_probe,
-	.remove	= fake_remove,
 	.driver = {
 		.name	= KUNIT_DEVICE_NAME,
 	},