uboot-envtools: add configuration for Bananapi BPi-R2

Add fw_env configuration for the BPi-R2 which is a mediatek/mt7623
devboard which can be booted from SD Card or eMMC.
Auto detect the boot device and add environment accordingly.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/boot/uboot-envtools/files/mediatek_mt7623

@@ -0,0 +1,25 @@
+#
+# Copyright (C) 2021 OpenWrt.org
+#
+
+[ -e /etc/config/ubootenv ] && exit 0
+
+touch /etc/config/ubootenv
+
+. /lib/uboot-envtools.sh
+. /lib/functions.sh
+
+board=$(board_name)
+
+case "$board" in
+bananapi,bpi-r2)
+	. /lib/upgrade/common.sh
+	export_bootdevice
+	export_partdevice ubootpart 1
+	ubootenv_add_uci_config "/dev/$ubootpart" "0xb0000" "0x10000" "0x10000" "1"
+esac
+
+config_load ubootenv
+config_foreach ubootenv_add_app_config ubootenv
+
+exit 0