dmaengine: dw-axi-dmac: Add support DMAX_NUM_CHANNELS > 16

Added support for DMA controller with more than 16 channels.

Signed-off-by: Sergey Khimich <serghox@gmail.com>
Link: https://lore.kernel.org/r/20231010101450.2949126-2-serghox@gmail.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>