dmaengine: allow dma support for async_tx to be toggled
Provide a config option for blocking the allocation of dma channels to
the async_tx api.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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Provide a config option for blocking the allocation of dma channels to
the async_tx api.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>