KVM: s390/pci: fix include duplicates

remove the duplicate includes. While at it sort the includes.

Reported-by: kernel test robot <yujie.liu@intel.com>
Fixes: 73f91b00 ("KVM: s390: pci: enable host forwarding of Adapter Event Notifications")
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>