Make the crypto opcode implementations have a higher priority than
those provides by the ring buffer based Niagara crypto device.

Also, several crypto opcode hashes were not setting the priority value
at all.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Put the opcode macros in a common header
Signed-off-by: NDavid S. Miller <davem@davemloft.net>