mtd: nand: docg4: 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 value set by mtdcore.

Signed-off-by: Frans Klaver <fransklaver@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index e5d7bca..510c12d 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -1316,7 +1316,7 @@
 	doc = (struct docg4_priv *) (nand + 1);
 	mtd->priv = nand;
 	nand->priv = doc;
-	mtd->owner = THIS_MODULE;
+	mtd->dev.parent = &pdev->dev;
 	doc->virtadr = virtadr;
 	doc->dev = dev;