mlxsw: Convert does-RIF-have-this-netdev queries to a dedicated helper

In a number of places, a netdevice underlying a RIF is obtained only to
compare it to another pointer. In order to clean up the interface between
the router and the other modules, add a new helper to specifically answer
this question, and convert the relevant uses to this new interface.

Signed-off-by: Petr Machata <[email protected]>
Reviewed-by: Amit Cohen <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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