net: dsa: export dsa_slave_dev_check

Using the NETDEV_CHANGEUPPER notifications, drivers can be aware when
they are enslaved to e.g. a bridge by calling netif_is_bridge_master().

Export this helper from DSA to get the equivalent functionality of
determining whether the upper interface of a CHANGEUPPER notifier is a
DSA switch interface or not.

Signed-off-by: Vladimir Oltean <[email protected]>
Acked-by: Florian Fainelli <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

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