net/mlx5: Move vport DOWN state check out of mlx5_query_vport_max_tx_speed()

mlx5_query_vport_max_tx_speed() was introduced to serve the
query_port_speed path, which uses max_tx_speed == 0 when port is down.

This is incorrect for callers that need the actual configured speed
regardless of vport state, such as modify-vport-state helpers
that must preserve the speed across state transitions.

Move this logic to the caller function in the verb flow and let
mlx5_query_vport_max_tx_speed() return the raw firmware value
unconditionally.

Fixes: aaecff5e13cd ("RDMA/mlx5: Implement query_port_speed callback")
Signed-off-by: Or Har-Toov <ohartoov@nvidia.com>
Reviewed-by: Shay Drori <shayd@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260816065015.3280733-3-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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