mlxsw: spectrum_router: Extract a helper from mlxsw_sp_port_vlan_router_join()

Split out of mlxsw_sp_port_vlan_router_join() the part that checks for RIF
and dispatches to __mlxsw_sp_port_vlan_router_join(), leaving it as wrapper
that just manages the router lock.

The new function, mlxsw_sp_port_vlan_router_join_existing(), will be useful
as an atom in later patches.

Signed-off-by: Petr Machata <[email protected]>
Reviewed-by: Amit Cohen <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

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