staging: unisys: fix VMCALL_IO_VISORSERIAL_ADDR_PARAMS

Remove the typedef from VMCALL_IO_VISORSERIAL_ADDR_PARAMS and use the
name struct vmcall_io_visorserial_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>