Disable pci on s390. Enable with pci=on.
Suggested-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>