dmaengine: ste_dma40: make stedma40_chan_cfg const

Make these const as they are only used during a copy operation.
Done using Coccinelle.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index c3052fb..f4fab41 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -79,7 +79,7 @@
 };
 
 /* Default configuration for physcial memcpy */
-static struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
+static const struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
 	.mode = STEDMA40_MODE_PHYSICAL,
 	.dir = DMA_MEM_TO_MEM,
 
@@ -93,7 +93,7 @@
 };
 
 /* Default configuration for logical memcpy */
-static struct stedma40_chan_cfg dma40_memcpy_conf_log = {
+static const struct stedma40_chan_cfg dma40_memcpy_conf_log = {
 	.mode = STEDMA40_MODE_LOGICAL,
 	.dir = DMA_MEM_TO_MEM,