dmaengine: dw-edma: Fix missing src/dst address of the interleaved xfers

The interleaved DMA transfers support was added in the commit 85e7518f
("dmaengine: dw-edma: Add device_prep_interleave_dma() support"). It
seems like the support was broken from the very beginning. Depending on
the selected channel either source or destination address are left
uninitialized which was obviously wrong. I don't really know how come the
original modification was working for the commit author. Anyway let's fix
it by initializing the destination address of the eDMA burst descriptors
for the DEV_TO_MEM interleaved operations and by initializing the source
address of the eDMA burst descriptors for the MEM_TO_DEV interleaved
operations.

Fixes: 85e7518f ("dmaengine: dw-edma: Add device_prep_interleave_dma() support")
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-By: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>