bnxt_en: Add a callback to inform RDMA driver during PCI shutdown.

bnxt_en: Add a callback to inform RDMA driver during PCI shutdown.

Orabug: 26402533, 26325599, 26366387

When bnxt_en gets a PCI shutdown call, we need to have a new callback
to inform the RDMA driver to do proper shutdown and removal.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 0efd2fc65c922dff207ff10a776a7a33e0e3c7c5)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>