[PATCH] Add Linux dts files and use them

[Sascha Hauer]

Some updates how I intend to handle upstream dts changes in barebox.

- I will merge the latest upstream dts changes to barebox for each Linux
  rc. Should dts changes introduce regressions this will at least give us
  the Linux rc which introduced it
- I will always merge dts updates to barebox next, not to master. While
  dts changes may be needed in master to fix regressions on one board,
  they could also introduce new regressions on other boards. Should we
  need dts changes to fix regressions in barebox master, we have to do
  it using overlays in arch/*/dts/ until an upstream fix arrives in dts/
- I will not send the dts updates to the list, I'll just merge them to
  barebox next some time after a new Linux rc arrived (As just happened
  with 3.15-rc3)

Sascha

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