Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20140708' into staging

Bugfixes for s390x: set subsystem id in the lowcore when booting from the
s390-ccw bios, and set the channel-program address after I/O completion,
when applicable.

# gpg: Signature made Tue 08 Jul 2014 14:18:20 BST using RSA key ID C6F02FAF
# gpg: Can't check signature: public key not found

* remotes/cohuck/tags/s390x-20140708:
  s390x/css: reflect cpa in scsw
  pc-bios/s390-ccw: update binary
  pc-bios/s390-ccw: store proper subsystem information word

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