profiles: iop: Do not build tar.gz rootfs

Building the tar.gz rootfs will not include device-specific packages, so its usefulness is limited and it causes more confusion than benefit.. Disable it. Users who need to poke into the rootfs, can extract the rootfs using dumpimage and unsquashfs and a script can be created, if there is a frequent need for this.

This reverts b3716a9f42d1 (iop: generate rootfs tar file, 2021-02-09) in old feeds/iopsys/iop/config.

Signed-off-by: Andreas Gnau andreas.gnau@iopsys.eu