cdrom: Install chroot into dracut environment

cdrom: Install chroot into dracut environment

- dracut-058 had a commit for base to not require chroot inside initramfs
- However the install of an iso requires chroot to be available for some of the actions
   such as the creation of the language cache etc.
- Adding the install of the chroot binary into the dracut command in the cdrom package
   allowed thye full installation of IPFire to be carried out.

Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>