bna: Add New HW Defs

Change details:
 - Add new file bna_hw_defs.h to support new code MSGQ, ENET and TX RX redign.
   This makes bna_hw.h obsolete and is removed in a later patch. bna_hw_defs.h
   removes all unused HW register definition that were part of bna_hw.h.

Signed-off-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>