staging: unisys: fix CamelCase names in do_locked_client_insert()

Fix CamelCase names:

pSignal => signal

Remove unused parameters issueInterruptIfEmpty and interruptHandle, and update
callers of this function.

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>