[][OpenWrt Dev][Add dual-boot support for mt7981]

[Description]
Add dual-boot support for mt7981

[Release-log]
N/A

Change-Id: Ibc1342b0fd1f285c84bc38159c96cabcbcc135a7
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6105795
diff --git a/target/linux/mediatek/mt7981/base-files/lib/upgrade/platform.sh b/target/linux/mediatek/mt7981/base-files/lib/upgrade/platform.sh
index 2cbde5c..29f970f 100644
--- a/target/linux/mediatek/mt7981/base-files/lib/upgrade/platform.sh
+++ b/target/linux/mediatek/mt7981/base-files/lib/upgrade/platform.sh
@@ -1,10 +1,10 @@
-RAMFS_COPY_BIN='mkfs.f2fs blkid blockdev'
+RAMFS_COPY_BIN='mkfs.f2fs blkid blockdev fw_printenv fw_setenv'
 platform_do_upgrade() {
 	local board=$(board_name)
 
 	case "$board" in
 	*snand*)
-		nand_do_upgrade "$1"
+		ubi_do_upgrade "$1"
 		;;
 	*emmc*)
 		mtk_mmc_do_upgrade "$1"