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-au1550.c b/drivers/spi/spi-au1550.c
index e196555..1d00d9b3 100644
--- a/drivers/spi/spi-au1550.c
+++ b/drivers/spi/spi-au1550.c
@@ -776,7 +776,7 @@
 	hw = spi_master_get_devdata(master);
 
 	hw->master = spi_master_get(master);
-	hw->pdata = pdev->dev.platform_data;
+	hw->pdata = dev_get_platdata(&pdev->dev);
 	hw->dev = &pdev->dev;
 
 	if (hw->pdata == NULL) {