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/include/usb.h b/include/usb.h
index a3323f5..9e1ec53 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -599,7 +599,7 @@
 /**
  * struct usb_platdata - Platform data about a USB controller
  *
- * Given a USB controller (UCLASS_USB) dev this is dev_get_platdata(dev)
+ * Given a USB controller (UCLASS_USB) dev this is dev_get_plat(dev)
  */
 struct usb_platdata {
 	enum usb_init_type init_type;