qualcommax: add Xiaomi Redmi AX5400 support

Author: coolsnowwolf

package/boot/uboot-envtools/files/qualcommax

@@ -71,7 +71,8 @@ link,nn6000-v2)
 	[ -n "$mmcpart" ] && \
 		ubootenv_add_uci_config "$mmcpart" "0x0" "0x40000" "0x20000"
 	;;
-xiaomi,ax6000)
+xiaomi,ax6000|\
+xiaomi,redmi-ax5400)
 	ubootenv_add_mtd "0:appsblenv" "0x0" "0x10000" "0x20000"
 	ubootenv_add_sys_mtd "bdata" "0x0" "0x10000" "0x20000"
 	;;