uboot-envtools: mt7622: add support for Ruijie RG-EW3200GX PRO

Add U-Boot environment settings for Ruijie RG-EW3200GX PRO to allow
users to access the bootloader environment using fw_printenv/fw_setenv
while running OpenWrt.

Signed-off-by: Langhua Ye <y1248289414@outlook.com>

package/boot/uboot-envtools/files/mediatek_mt7622

@@ -35,6 +35,9 @@ bananapi,bpi-r64)
 buffalo,wsr-2533dhp2)
 	ubootenv_add_uci_config "/dev/mtd3" "0x0" "0x1000" "0x20000"
 	;;
+ruijie,rg-ew3200gx-pro)
+	ubootenv_add_uci_config "/dev/mtd3" "0x0" "0x20000" "0x20000"
+	;;
 ubnt,unifi-6-lr-ubootmod)
 	ubootenv_add_uci_config "/dev/mtd2" "0x0" "0x4000" "0x10000"
 	;;