init: The mount android logic has been moved to lxc-android-config

See: https://gitlab.com/ubports/core/hybris-support/lxc-android-config/-/merge_requests/52

This also makes it so we need to have a different versions for xenial and focal

NOTE: we also need to rename /var/lib/lxc/android/... android-rootfs.img to android.img again, else initrd will setup things wrong for us.