spi: use dev_get_platdata()

Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index 222d3e3..5cd6398 100644
--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -872,8 +872,8 @@
 		goto free_master;
 	}
 
-	if (pdev->dev.platform_data) {
-		pdata = pdev->dev.platform_data;
+	if (dev_get_platdata(&pdev->dev)) {
+		pdata = dev_get_platdata(&pdev->dev);
 		dspi->pdata = *pdata;
 	} else {
 		/* update dspi pdata with that from the DT */