net/mlx5: Introduce ifc bits for using software vhca id

[ Upstream commit 0372c546 ]

Introduce ifc related stuff to enable using software vhca id
functionality.

Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Stable-dep-of: 9ca05b0f ("RDMA/mlx5: Rely on RoCE fw cap instead of devlink when setting profile")
Signed-off-by: Sasha Levin <sashal@kernel.org>