Fallback to backdoor register access to collect dumps if firmware
is crashed.  Fixes TID, SGE Queue Context, and MPS TCAM dump collection.
Signed-off-by: NRahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: NGanesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>