s390x/css: ccw translation infrastructure

s390x/css: ccw translation infrastructure

Implement a basic infrastructure of handling channel I/O instruction
interception for passed through subchannels:
1. Branch the code path of instruction interception handling by
   SubChannel type.
2. For a passed-through subchannel, issue the ORB to kernel to do ccw
   translation and perform an I/O operation.
3. Assign different condition code based on the I/O result, or
   trigger a program check.

Signed-off-by: Xiao Feng Ren <[email protected]>
Signed-off-by: Dong Jia Shi <[email protected]>
Message-Id: <20170517004813[email protected]>
Signed-off-by: Cornelia Huck <[email protected]>