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Some platforms (e.g. Picochip PC3XX) have multiple DMA controllers where some may be used for slave transfers and others for general purpose memcpy type transfers. Add a .is_private boolean to the platform data structure so that controllers can be marked as private so that the DMA_PRIVATE capability will be set for that controller. Signed-off-by: Jamie Iles <jamie.iles@picochip.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>