uboot-envtools: cns3xxx: remove config file

This file is a leftover of cns3xxx target which has been dropped
in commit a9790dff532e ("cns3xxx: drop target").

Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19191
Signed-off-by: Hauke Mehrtens <[email protected]>

package/boot/uboot-tools/uboot-envtools/files/cns3xxx

@@ -1,26 +0,0 @@
-#
-# Copyright (C) 2013 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
-laguna)
-	# Laguna uboot env size/erasesize vary depending on NOR vs SPI FLASH
-	size=$(grep mtd1 /proc/mtd | awk '{print $2}')
-	erasesize=$(grep mtd1 /proc/mtd | awk '{print $3}')
-	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x$size" "0x$erasesize"
-	;;
-esac
-
-config_load ubootenv
-config_foreach ubootenv_add_app_config ubootenv
-
-exit 0