staging: unisys: Fix VMCALL_IO_DIAG_ADDR_PARAMS

Remove the typedef from VMCALL_IO_DIAG_ADDR_PARAMS and use the name
struct vmcall_io_diag_addr_params instead. Fix CamelCase member names:

ChannelAddress => address

Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>