net/mlx5: Light probe local SFs

In case user wants to configure the SFs, for example: to use only vdpa
functionality, he needs to fully probe a SF, configure what he wants,
and afterward reload the SF.

In order to save the time of the reload, local SFs will probe without
any auxiliary sub-device, so that the SFs can be configured prior to
its full probe.

The defaults of the enable_* devlink params of these SFs are set to
false.

Usage example:
Create SF:
$ devlink port add pci/0000:08:00.0 flavour pcisf pfnum 0 sfnum 11
$ devlink port function set pci/0000:08:00.0/32768 \
               hw_addr 00:00:00:00:00:11 state active

Enable ETH auxiliary device:
$ devlink dev param set auxiliary/mlx5_core.sf.1 \
              name enable_eth value true cmode driverinit

Now, in order to fully probe the SF, use devlink reload:
$ devlink dev reload auxiliary/mlx5_core.sf.1

At this point the user have SF devlink instance with auxiliary device
for the Ethernet functionality only.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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