Some platforms do not have grub2, and some require other partitions.
Anaconda will add platform specific partitions if the 'reqpart' command
is included, and it will add bootloader specific packages to the list if
they are needed.
Related: rhbz#1673744
This is required to ensure that SELinux is configured properly while
building. It fixes the problem with building tar, and should be
installed in the other image types for consistency.
Resolves: rhbz#1645189