Upstream devicetrees use a newer DT binding using cpsw-switch
compatibles. The bindings are a bit different, so two functions are
introduced to capture the differences, cpsw_eth_of_to_plat_switch() and
cpsw_eth_of_to_plat_legacy().
Signed-off-by: Markus Schneider-Pargmann (TI) <msp@baylibre.com>
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