hw/s390x: Remove the possibility to load the s390-netboot.img binary

Since the netboot code has now been merged into the main s390-ccw.img
binary, we don't need the separate s390-netboot.img anymore. Remove
it and the code that was responsible for loading it.

Message-Id: <20240621082422.136217-6-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
5 files changed