staging: unisys: fix CamelCased Parahotplug globals

Fix the CamelCase names:

Parahotplug_request_list => parahotplug_request_list
Parahotplug_request_list_lock => parahotplug_request_list_lock

Update references to use the corrected names.

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