mlxsw: spectrum_switchdev: remove transactional logic for VLAN objects

As of commit 457e20d65924 ("mlxsw: spectrum_switchdev: Avoid returning
errors in commit phase"), the mlxsw driver performs the VLAN object
offloading during the prepare phase. So conversion just seems to be a
matter of removing the code that was running in the commit phase.

Ido Schimmel explains that the reason why mlxsw_sp_span_respin is called
unconditionally is because the bridge driver will ignore -EOPNOTSUPP and
actually add the VLAN on the bridge device - see commit 9c86ce2c1ae3
("net: bridge: Notify about bridge VLANs") and commit ea4721751977
("mlxsw: spectrum_switchdev: Ignore bridge VLAN events"). Since the VLAN
was successfully added on the bridge device, mlxsw_sp_span_respin_work()
should be able to resolve the egress port for a packet that is mirrored
to a gre tap and passes through the bridge device. Therefore keep the
logic as it is.

Signed-off-by: Vladimir Oltean <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Acked-by: Jiri Pirko <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

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