dmaengine: fsl-edma: remove redundant "idle" field from fsl_chan

The 'idle' in fsl_chan is redundant as it's equivalent to
'status != DMA_IN_PROGRESS'. So remote it to simple code logic.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240603152317.69917-2-Frank.Li@nxp.com


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