dmaengine: use DEFINE_IDR for static initialization
We could use DEFINE_IDR for statically allocated idr that allow us to save a few lines of code. And also remove unneeded mutex_init() for dma_list_mutex, as dma_list_mutex is initialized automatically by DEFINE_MUTEX(). Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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