[openwrt/openwrt] mediatek: fix writing bananapi bpi-r64 env

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/cd7a9909d54a860443350d18848e9ba4df2609d3

commit cd7a9909d54a860443350d18848e9ba4df2609d3
Author: Oskari Lemmela <oskari at lemmela.net>
AuthorDate: Sat Apr 10 20:16:06 2021 +0300

    mediatek: fix writing bananapi bpi-r64 env
    
    Use generic functions to get env partition.
    
    Fixes: 7043e4334f0 ("mediatek: mt7622: improve sysupgrade on MMC")
    Signed-off-by: Oskari Lemmela <oskari at lemmela.net>
---
 package/boot/uboot-envtools/files/mediatek | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/package/boot/uboot-envtools/files/mediatek b/package/boot/uboot-envtools/files/mediatek
index 4194ad2af0..11d48adaa7 100644
--- a/package/boot/uboot-envtools/files/mediatek
+++ b/package/boot/uboot-envtools/files/mediatek
@@ -17,9 +17,10 @@ linksys,e8450-ubi)
 	ubootenv_add_uci_config "/dev/ubi0_1" "0x0" "0x1f000" "0x1f000" "1"
 	;;
 bananapi,bpi-r64)
-	. /lib/upgrade/platform.sh
-	local rootdev=$(get_rootdev)
-	local envdev=/dev/$(get_partition $rootdev ubootenv)
+	. /lib/upgrade/common.sh
+	export_bootdevice
+	export_partdevice rootdev 0
+	local envdev=/dev/$(get_partition_by_name $rootdev ubootenv)
 	ubootenv_add_uci_config "$envdev" "0x0" "0x80000" "0x80000" "1"
 	ubootenv_add_uci_config "$envdev" "0x80000" "0x80000" "0x80000" "1"
 	;;