dma: axi-dmac: Add support for interleaved cyclic transfers

An example when this mode can be enabled is where the controller
is used as a Video DMA.

Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com>

drivers/dma/dma-axi-dmac.c

@@ -613,6 +613,9 @@ static struct dma_async_tx_descriptor *axi_dmac_prep_interleaved(
 		desc->sg[0].y_len = 1;
 	}
 
+	if (flags & DMA_CYCLIC)
+		desc->cyclic = true;
+
 	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
 }