pistachio: Add mtd device name from dts

Parse the "linux,mtd-name" property also for SPI NAND flashes.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/pistachio/patches-5.4/401-mtd-nor-support-mtd-name-from-device-tree.patch

@@ -32,3 +32,23 @@ Signed-off-by: Abhimanyu Vishwakarma <Abhimanyu.Vishwakarma@imgtec.com>
  		mtd->name = dev_name(dev);
  	mtd->priv = nor;
  	mtd->type = MTD_NORFLASH;
+--- a/drivers/mtd/mtdcore.c
++++ b/drivers/mtd/mtdcore.c
+@@ -778,6 +778,17 @@ out_error:
+  */
+ static void mtd_set_dev_defaults(struct mtd_info *mtd)
+ {
++#ifdef CONFIG_MTD_OF_PARTS
++	const char __maybe_unused *of_mtd_name = NULL;
++	struct device_node *np;
++
++	np = mtd_get_of_node(mtd);
++	if (np && !mtd->name) {
++		of_property_read_string(np, "linux,mtd-name", &of_mtd_name);
++		if (of_mtd_name)
++			mtd->name = of_mtd_name;
++	} else
++#endif
+ 	if (mtd->dev.parent) {
+ 		if (!mtd->owner && mtd->dev.parent->driver)
+ 			mtd->owner = mtd->dev.parent->driver->owner;