staging: unisys: refactor SignalInit Macro

Rename SignalInit to spar_signal_init, and fix CamelCase names:

VersionId => version
Type => chtype
Size => size
SignalSize => signal_size
oSignalBase => sig_base_offset
MaxSignalSlots => max_slots
MaxSignals => max_signals

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