staging: unisys: fix CamelCase in struct signal_queue_header

Fix CamelCase names:
VersionId => version
Type => chtype
Size => size
oSignalBase => sig_base_offset
FeatureFlags => features
NumSignalsSent => num_sent
NumOverflows => num_overflows
SignalSize => signal_size
MaxSignalSlots => max_slots
MaxSignals => max_signals
Head => head
NumSignalsReceived => num_received
Tail => tail
Reserved1 => reserved1
Reserved2 => reserved2
ClientQueue => client_queue
NumInterruptsReceived => num_irq_received
NumEmptyCnt => num_empty
ErrorFlags => errorflags
Filler => filler

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