Merge branch 'dsa-simplify-switchdev-prepare-phase'

Vivien Didelot says:

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net: dsa: simplify switchdev prepare phase

This patch series brings no functional changes.

It removes the unused switchdev_trans arguments from the dsa_switch_ops
for both MDB and VLAN operations, and provides functions to prepare and
add these objects for a given bitmap of ports.
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Signed-off-by: David S. Miller <davem@davemloft.net>