net: bridge: mst: Add helper to query a port's MST state

This is useful for switchdev drivers who are offloading MST states
into hardware. As an example, a driver may wish to flush the FDB for a
port when it transitions from forwarding to blocking - which means
that the previous state must be discoverable.

Signed-off-by: Tobias Waldekranz <[email protected]>
Reviewed-by: Vladimir Oltean <[email protected]>
Acked-by: Nikolay Aleksandrov <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

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