dmaengine: plx_dma: Don't set chancnt

The dma framework will calculate the dma channels chancnt, setting it
ourself is wrong.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Acked-by: Logan Gunthorpe <logang@deltatee.com>
Link: https://lore.kernel.org/r/20230521100252.3197-4-jszhang@kernel.org


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