Adding libubootenv-tool into bullseye image (#10146)

Why I did it
uboot env get and set commands fw_printenv/fw_setenv are not available in bullseye sonic image. Some platforms using them where failing. Ex: sonic-installer commands in marvell-armhf.

In case of buster, u-boot-tools was providing these commands.

How I did it
Added libubootenv-tool which provides these tools along with other uboot tools in build_debian.sh.

How to verify it
root@localhost:# fw_printenv serverip
serverip=10.4.50.39
root@localhost:# fw_setenv serverip 10.4.50.38
root@localhost:~# fw_printenv serverip
serverip=10.4.50.38

Change-Id: I558f8737f41d83d3e8527ce340391ae8f978b6d8
Signed-off-by: Pavan Naregundi <pnaregundi@marvell.com>

Author: pavannaregundi

build_debian.sh

@@ -190,7 +190,7 @@ if [ -f platform/$CONFIGURED_PLATFORM/modules ]; then
 fi
 
 ## Add mtd and uboot firmware tools package
-sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install u-boot-tools mtd-utils device-tree-compiler
+sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install u-boot-tools libubootenv-tool mtd-utils device-tree-compiler
 
 ## Install docker
 echo '[INFO] Install docker'