staging: unisys: fix CamelCase global ControlVm_payload_info

Rename the CamelCase global structure

ControlVm_payload_info => controlvm_payload_info

Move the declaration to the struct definition, and update all references
to use the new name.

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