staging: unisys: fix CamelCase names in struct irq_info

Fix CamelCase names in structure, and references to them:

sendInterruptHandle => send_irq_handle
recvInterruptHandle => recv_irq_handle
recvInterruptVector => recv_irq_vector
recvInterruptShared => recv_irq_shared

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