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/mvpp2.c b/drivers/net/mvpp2.c
index 326f91c..d266e6d 100644
--- a/drivers/net/mvpp2.c
+++ b/drivers/net/mvpp2.c
@@ -5186,7 +5186,7 @@
 
 static int mvpp2_start(struct udevice *dev)
 {
-	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct eth_pdata *pdata = dev_get_plat(dev);
 	struct mvpp2_port *port = dev_get_priv(dev);
 
 	/* Load current MAC address */