dmaengine: dma-jz4780: Avoid hardcoding number of channels
As part of the work to support various other Ingenic JZ47xx SoC versions, which don't feature the same number of DMA channels per core, we now deduce the number of DMA channels available from the devicetree compatible string. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
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