net/mlx5: E-Switch, Register representors for adjacent vports

Register representors for adjacent vports dynamically when they are
discovered. Dynamically added representors state will now be set to
'REGISTERED' when the representor type was already registered,
otherwise they won't be loaded.

Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250829223722.900629-6-saeed@kernel.org


Signed-off-by: Paolo Abeni <pabeni@redhat.com>