vfio/ccw: identify CCW data addresses as physical

The CCW data address created by vfio-ccw is that of an IDAL
built by this code. Since this address is used by real hardware,
it should be a physical address rather than a virtual one.
Let's clarify it as such in the ORB.

Similarly, once the I/O has completed the memory for that IDAL
needs to be released, so convert the CCW data address back to
a virtual address so that kfree() can process it.

Note: this currently doesn't fix a real bug, since virtual
addresses are identical to physical ones.

Signed-off-by: Eric Farman <[email protected]>
Reviewed-by: Matthew Rosato <[email protected]>
Reviewed-by: Nico Boehr <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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