Add support and infrastructure for RDMA TRANSPORT

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Hi,

This is preparation series targeted for mlx5-next, which will be used
later in RDMA.

This series adds RDMA transport steering logic which would allow the
vport group manager to catch control packets from VFs and forward them
to control SW to help with congestion control.

In addition, RDMA will provide new set of APIs to better control exposed
FW capabilities and this series is needed to make sure mlx5 command
interface will ensure that privileged commands can always proceed,

Thanks

Link: https://lore.kernel.org/all/cover.1740574103.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
* mlx5-next:
  net/mlx5: fs, add RDMA TRANSPORT steering domain support
  net/mlx5: Query ADV_RDMA capabilities
  net/mlx5: Limit non-privileged commands
  net/mlx5: Allow the throttle mechanism to be more dynamic
  net/mlx5: Add RDMA_CTRL HW capabilities