Since void defaults to building an 'initramfs-<kernelversion>.img' file
when running the update hook, I think it is just correct if we follow
their example.
This will make it harder to distinguish between kernels if you have many
others in the boot dir (e.g. Arch, or LTS) but that seems only an edge
case.
By setting the `desired_package_state` variable we can change if ansible
should only ensure that the packages exist on the system (`present`) or
that they are also updated to their latest version (`latest`).
