kernel: fix mtd/NVMEM regression affecting U-Boot env NVMEM driver

Fixes: 20736013e9 ("kernel: backport nvmem v6.6 fixes and v6.7 changes")
Fixes: https://github.com/openwrt/openwrt/issues/13831
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit c997634c01)

target/linux/ath79/patches-5.15/401-mtd-nor-support-mtd-name-from-device-tree.patch

@@ -34,7 +34,7 @@ Signed-off-by: Abhimanyu Vishwakarma <Abhimanyu.Vishwakarma@imgtec.com>
  	mtd->type = MTD_NORFLASH;
 --- a/drivers/mtd/mtdcore.c
 +++ b/drivers/mtd/mtdcore.c
-@@ -847,6 +847,17 @@ out_error:
+@@ -870,6 +870,17 @@ out_error:
   */
  static void mtd_set_dev_defaults(struct mtd_info *mtd)
  {