mtd: rawnand: ams-delta: show parent device in sysfs

Fix a bug where parent device symlinks aren't shown in sysfs.

While at it, make use of the default owner set by mtdcore.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/mtd/nand/raw/ams-delta.c

@@ -160,7 +160,7 @@ static int ams_delta_init(struct platform_device *pdev)
 	}
 
 	ams_delta_mtd = nand_to_mtd(this);
-	ams_delta_mtd->owner = THIS_MODULE;
+	ams_delta_mtd->dev.parent = &pdev->dev;
 
 	/*
 	 * Don't try to request the memory region from here,