Fs iso9660 support

zcat /proc/config.gz | grep -e ISO9660 
# CONFIG_ISO9660_FS is not set
sudo mount -o loop ubuntu.iso /mnt/iso
mount: /mnt/iso: unknown filesystem type 'iso9660'.

seems the most simple way to add the is09660support is not very simple Error unknown systemfile type 'ISO9660', - #4 by linuxdev but can be done via building kernel modules

 make ARCH=arm64 O=$TEGRA_KERNEL_OUT -j 6 KERNEL_MODULES_OUT=~/out/modules
make[1]: Entering directory '/home/nvidia/out'
  GEN     ./Makefile
scripts/kconfig/conf  --silentoldconfig Kconfig
* Restart config...
* CD-ROM/DVD Filesystems
ISO 9660 CDROM file system support (ISO9660_FS) [M/n/y/?] m
  Microsoft Joliet CDROM extensions (JOLIET) [N/y/?] (NEW) 
  Transparent decompression extension (ZISOFS) [N/y/?] (NEW) 
UDF file system support (UDF_FS) [M/n/y/?] m
# configuration written to .config

attached ko is built on nx devkit Jetpack 4.6.1
isofs.ko (1.0 MB)