Change details:
 -      Remove unnecessary prefetch
 -      Simplify checking & comparison of CQ flags
 -      Dereference & store unmap_array, unmap_cons & current unmap_array
        element only once
 -      Make structures tx_config & rx_config cache line aligned.
Signed-off-by: NRasesh Mody <rmody@brocade.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>