dmaengine: dw: platform: Use struct dw_dma_chip_pdata

Now, when we have a generic structure for the chip and platform data,
use it in the platform glue driver.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20190820131546.75744-5-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>