dmaengine: imx: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/imx-dma.c

@@ -193,7 +193,7 @@ struct imxdma_filter_data {
 	int			 request;
 };
 
-static struct platform_device_id imx_dma_devtype[] = {
+static const struct platform_device_id imx_dma_devtype[] = {
 	{
 		.name = "imx1-dma",
 		.driver_data = IMX1_DMA,

drivers/dma/imx-sdma.c

@@ -420,7 +420,7 @@ static struct sdma_driver_data sdma_imx6q = {
 	.script_addrs = &sdma_script_imx6q,
 };
 
-static struct platform_device_id sdma_devtypes[] = {
+static const struct platform_device_id sdma_devtypes[] = {
 	{
 		.name = "imx25-sdma",
 		.driver_data = (unsigned long)&sdma_imx25,