RDMA/bnxt_re: Enable SRIOV VF support on Broadcom's 57500 adapter series

[ Upstream commit 39c48c51

 ]

Broadcom's 575xx adapter series has support for SRIOV VFs.  Making changes
to enable SRIOV VF support. There are two major area where changes are
done:

 - Added new DB location for control-path and data-path DB ring

 - New devices do not need to issue the sriov-config slow-path command
   thus, skipping to call that firmware command.

For now enabling support for 64 RoCE VFs.

Link: https://lore.kernel.org/r/1570081715-14301-1-git-send-email-devesh.sharma@broadcom.com
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Stable-dep-of: 349e3c0c

 ("RDMA/bnxt_re: Fix a possible memory leak")
Signed-off-by: Sasha Levin <sashal@kernel.org>