This adds a new livemedia-creator argument, --extra-boot-args, which can
be used to add arguments to the kernel command-line in the templates.
Resolves: rhbz#1689314
We didn't add "efiarch32" on aarch64 because it made no sense, but we
need to because it's not an optional argument in the other template.
Just make it efiarch32=None.
Also fixes a typo in share/live/uefi.tmpl
Related: rhbz#1310775
This adds the aarch64 template, and the grub2-efi config file to the
live template directory.
Resolves: rhbz#1369014
(cherry picked from commit 89c7a93508b7328fc9c180164b23fae29bcd022b)
