Both devices share most of their setup except buttons and LEDs,
so having a common DTSI removes a lot of duplicate code.
In order to have a shared partitioning scheme, device-id and
product-info from AD7200 have been merged into a single
product-info partition like for C2600.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
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