dma: sh_dma: not all SH DMAC implementations support MEMCPY
Add a flag to allow platforms to specify, whether a DMAC instance supports the MEMCPY operation. To avoid regressions, preserve the current default. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
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