Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20160711' into staging

Last round of s390x patches for 2.7:
- A large update of the s390x PCI code, bringing it in line with
  the architecture
- Fixes and improvements in the ipl (boot) code
- Refactoring in the css code

# gpg: Signature made Mon 11 Jul 2016 09:04:51 BST
# gpg:                using RSA key 0xDECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20160711: (25 commits)
  s390x/pci: make hot-unplug handler smoother
  s390x/pci: replace fid with idx in msg data of msix
  s390x/pci: fix stpcifc_service_call
  s390x/pci: refactor list_pci
  s390x/pci: refactor s390_pci_find_dev_by_idx
  s390x/pci: add checkings in CLP_SET_PCI_FN
  s390x/pci: enable zpci hot-plug/hot-unplug
  s390x/pci: enable uid-checking
  s390x/pci: introduce S390PCIBusDevice qdev
  s390x/pci: introduce S390PCIIOMMU
  s390x/pci: introduce S390PCIBus
  s390x/pci: enforce zPCI state checking
  s390x/pci: refactor s390_pci_find_dev_by_fh
  s390x/pci: unify FH_ macros
  s390x/pci: write fid in CLP_QUERY_PCI_FN
  s390x/pci: acceleration for getting S390pciState
  s390x/pci: fix failures of dma map/unmap
  s390x/css: Unplug handler of virtual css bridge
  s390x/css: Factor out virtual css bridge and bus
  s390x/css: use define for "virtual-css-bridge" literal
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>