Comment # 3 on bug 1134303 from Andreas F�rber

The patch looks okay to me so far. However it is only for aarch64 and may need
to be revisited later for jsc#PM-26 if we choose to package Image.gz or
something.

For %arm it would need to be the zImage equivalent.
Not sure whether the other non-x86 architectures care.

There are some sections further down the file that set an $image variable with
the name - maybe it would make sense to rearrange the code so that we can just
reuse that variable instead of duplicating it?