dm: treewide: Rename dev_get_platdata() to dev_get_plat()

Rename this to be consistent with the change from 'platdata'.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/gpio/imx_rgpio2p.c b/drivers/gpio/imx_rgpio2p.c
index 80e934e..70ced75 100644
--- a/drivers/gpio/imx_rgpio2p.c
+++ b/drivers/gpio/imx_rgpio2p.c
@@ -132,7 +132,7 @@
 static int imx_rgpio2p_probe(struct udevice *dev)
 {
 	struct imx_rgpio2p_data *bank = dev_get_priv(dev);
-	struct imx_rgpio2p_plat *plat = dev_get_platdata(dev);
+	struct imx_rgpio2p_plat *plat = dev_get_plat(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 	int banknum;
 	char name[18], *str;