dm: treewide: Rename ..._platdata variables to just ..._plat

Try to maintain some consistency between these variables by using _plat as
a suffix for them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/ufs/ufs.c b/drivers/ufs/ufs.c
index fe43f1b..13e730b 100644
--- a/drivers/ufs/ufs.c
+++ b/drivers/ufs/ufs.c
@@ -1865,7 +1865,7 @@
 int ufshcd_probe(struct udevice *ufs_dev, struct ufs_hba_ops *hba_ops)
 {
 	struct ufs_hba *hba = dev_get_uclass_priv(ufs_dev);
-	struct scsi_platdata *scsi_plat;
+	struct scsi_plat *scsi_plat;
 	struct udevice *scsi_dev;
 	int err;