[openwrt/openwrt] mediatek: remove no longer needed sysupgrade hack

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/7e7218d1331d0b557b0e9a513aef5de584b6b1d2

commit 7e7218d1331d0b557b0e9a513aef5de584b6b1d2
Author: Daniel Golle <daniel at makrotopia.org>
AuthorDate: Sun Mar 7 18:15:50 2021 +0000

    mediatek: remove no longer needed sysupgrade hack
    
    Keeping configuration is now handled in fstools like for other types
    of flash as well.
    
    Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 .../mt7622/base-files/lib/preinit/79_move_config       | 18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/target/linux/mediatek/mt7622/base-files/lib/preinit/79_move_config b/target/linux/mediatek/mt7622/base-files/lib/preinit/79_move_config
deleted file mode 100644
index 8a30b84497..0000000000
--- a/target/linux/mediatek/mt7622/base-files/lib/preinit/79_move_config
+++ /dev/null
@@ -1,18 +0,0 @@
-. /lib/upgrade/common.sh
-
-RECOVERY_PART=/dev/mmcblk0p6
-
-move_config() {
-	if [ -b $RECOVERY_PART ]; then
-		insmod nls_cp437
-		insmod nls_iso8859-1
-		insmod fat
-		insmod vfat
-		mkdir -p /recovery
-		mount -o rw,noatime $RECOVERY_PART /recovery
-		[ -f "/recovery/$BACKUP_FILE" ] && mv -f "/recovery/$BACKUP_FILE" /
-		umount /recovery
-	fi
-}
-
-boot_hook_add preinit_mount_root move_config