The compressed kernel image is built since commit "[S390] add support for
compressed kernels" (1844c9bc).
Now install the compressed kernel image (bzImage) as default.
Signed-off-by: NHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>