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/common/usb_storage.c b/common/usb_storage.c
index 7e6db49..5d6f704 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -207,7 +207,7 @@
 	 * is shared by all LUNs (block devices) attached to this mass storage
 	 * device.
 	 */
-	data = dev_get_platdata(udev->dev);
+	data = dev_get_plat(udev->dev);
 	if (!usb_storage_probe(udev, 0, data))
 		return 0;
 	max_lun = usb_get_max_lun(data);