net: dsa: extract dsa switch tree setup and removal
Extract the core logic that setups a 'struct dsa_switch_tree' and removes it, update dsa_probe() and dsa_remove() to use the two helper functions. This will be useful to allow for other callers to setup this structure differently. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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