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/demo/demo-shape.c b/drivers/demo/demo-shape.c
index cc99f3e..b13a4ee 100644
--- a/drivers/demo/demo-shape.c
+++ b/drivers/demo/demo-shape.c
@@ -28,7 +28,7 @@
 /* Crazy little function to draw shapes on the console */
 static int shape_hello(struct udevice *dev, int ch)
 {
-	const struct dm_demo_pdata *pdata = dev_get_platdata(dev);
+	const struct dm_demo_pdata *pdata = dev_get_plat(dev);
 	struct shape_data *data = dev_get_priv(dev);
 	static const struct shape {
 		int start;
@@ -142,7 +142,7 @@
 
 static int shape_ofdata_to_platdata(struct udevice *dev)
 {
-	struct dm_demo_pdata *pdata = dev_get_platdata(dev);
+	struct dm_demo_pdata *pdata = dev_get_plat(dev);
 	int ret;
 
 	/* Parse the data that is common with all demo devices */