bna: Remove Obsolete Files

Change details:
 - Removec bfi_ll.h bna_hw.h bna_ctrl.c and bna_txrx.c due to ENET, MSGQ
   and TXRX changes for new FW Driver interface and TX RX re-design.

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