staging: unisys: clean up CamelCase in struct add_virt_iopart

Clean up CamelCase names:
guestHandle => guest_handle
recvBusInterruptHandle => recv_bus_irq_handle
useG2GCopy => use_g2g_copy
Filler => filler
busNo => bus_no
dev_no => dev_no

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