mtd: maps: gpio-addr-flash: show parent device in sysfs

Fix a bug where mtd parent device symlinks aren't shown in sysfs.
Signed-off-by: NFrans Klaver <fransklaver@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

drivers/mtd/maps/gpio-addr-flash.c

@@ -266,7 +266,7 @@ static int gpio_flash_probe(struct platform_device *pdev)
 		kfree(state);
 		return -ENXIO;
 	}
-
+	state->mtd->dev.parent = &pdev->dev;
 
 	mtd_device_parse_register(state->mtd, part_probe_types, NULL,
 				  pdata->parts, pdata->nr_parts);