dma: imx-dma: configure the generic DMA type to make it work

dma: imx-dma: configure the generic DMA type to make it work

Commit dea7a9f
  dmaengine: imx-dma: remove dma_slave_config direction usage

changes the method from a "configuration when called" to an "configuration
when used". Due to this, only the cyclic DMA type gets configured
correctly, while the generic DMA type is left non-configured.

Without this additional call, the struct imxdma_channel::word_size member
is stuck at DMA_SLAVE_BUSWIDTH_UNDEFINED and imxdma_prep_slave_sg() always
returns NULL.

Signed-off-by: Juergen Borleis <jbe@pengutronix.de>
Link: https://lore.kernel.org/r/20210729071821.9857-1-jbe@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>