staging: unisys: Move phys_info to iochannel.h

This moves phys_info to iochannel.h. It is only
used by iochannel.h and is not needed in
vmcallinterfaces.h.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>