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/net/bcm6368-eth.c b/drivers/net/bcm6368-eth.c
index 6e6548a..29abe7f 100644
--- a/drivers/net/bcm6368-eth.c
+++ b/drivers/net/bcm6368-eth.c
@@ -506,7 +506,7 @@
 
 static int bcm6368_eth_probe(struct udevice *dev)
 {
-	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct eth_pdata *pdata = dev_get_plat(dev);
 	struct bcm6368_eth_priv *priv = dev_get_priv(dev);
 	int num_ports, ret, i;
 	ofnode node;