This reorganizes 02_network board.d files based on what's done for
ath79 and ramips: Instead of putting all settings into a single big
case, the interface/dsl/MAC address setup is put into separate
functions with a specific switch case for each of them. This makes
grouping of devices much easier and should be easier to read, too.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
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