The power-management functions are unused since the 'commit 394216275c7d ("s390: remove broken hibernate / power management support")'. Remove these unused pm callbacks from io-subchannel drivers. Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>