staging: unisys: refactor visor_signal_remove()

Rename visor_signal_remove() to spar_signal_remove() and fix CamelCase
parameter names:

pChannel => ch
Queue => queue
pSignal => sig

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