Refactor 82xx driver to support new adapter - Qlogic 83XX CNA

Create adapter abstraction layer and seperate 82xx hardware access routines.
Create mailbox based HW interface mechanism
Signed-off-by: NAnirban Chakraborty <anirban.chakraborty@qlogic.com>
Signed-off-by: NSony Chacko <sony.chacko@qlogic.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>