staging: unisys: rename Initialize_incoming_thread()

Fix the CamelCase name of this function:

Initialize_incoming_thread => initialize_incoming_thread

Update all references to use the new name.

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