Add a directory by kernel instead of a common root, add qnap-301w and rpi4 kernel 6.1 suppport

root/target/linux/generic/hack-6.1/420-mtd-set-rootfs-to-be-root-dev.patch

@@ -1,39 +0,0 @@
-From: Gabor Juhos <juhosg@openwrt.org>
-Subject: kernel/3.1[02]: move MTD root device setup code to mtdcore
-
-The current code only allows to automatically set
-root device on MTD partitions. Move the code to MTD
-core to allow to use it with all MTD devices.
-
-Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
----
- drivers/mtd/mtdcore.c | 10 ++++++++++
- 1 file changed, 10 insertions(+)
-
---- a/drivers/mtd/mtdcore.c
-+++ b/drivers/mtd/mtdcore.c
-@@ -27,6 +27,7 @@
- #include <linux/reboot.h>
- #include <linux/leds.h>
- #include <linux/debugfs.h>
-+#include <linux/root_dev.h>
- #include <linux/nvmem-provider.h>
- 
- #include <linux/mtd/mtd.h>
-@@ -751,6 +752,16 @@ int add_mtd_device(struct mtd_info *mtd)
- 	   of this try_ nonsense, and no bitching about it
- 	   either. :) */
- 	__module_get(THIS_MODULE);
-+
-+	if (!strcmp(mtd->name, "rootfs") &&
-+	    IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
-+	    ROOT_DEV == 0) {
-+		unsigned int index = mtd->index;
-+		pr_notice("mtd: device %d (%s) set to be root filesystem\n",
-+			  mtd->index, mtd->name);
-+		ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, index);
-+	}
-+
- 	return 0;
- 
- fail_nvmem_add: