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/rtl8139.c b/drivers/net/rtl8139.c
index c171e54..feeea93 100644
--- a/drivers/net/rtl8139.c
+++ b/drivers/net/rtl8139.c
@@ -660,7 +660,7 @@
 #else /* DM_ETH */
 static int rtl8139_start(struct udevice *dev)
 {
-	struct eth_pdata *plat = dev_get_platdata(dev);
+	struct eth_pdata *plat = dev_get_plat(dev);
 	struct rtl8139_priv *priv = dev_get_priv(dev);
 
 	memcpy(priv->enetaddr, plat->enetaddr, sizeof(plat->enetaddr));
@@ -704,7 +704,7 @@
 
 static int rtl8139_write_hwaddr(struct udevice *dev)
 {
-	struct eth_pdata *plat = dev_get_platdata(dev);
+	struct eth_pdata *plat = dev_get_plat(dev);
 	struct rtl8139_priv *priv = dev_get_priv(dev);
 
 	memcpy(priv->enetaddr, plat->enetaddr, sizeof(plat->enetaddr));
@@ -735,7 +735,7 @@
 
 static int rtl8139_probe(struct udevice *dev)
 {
-	struct eth_pdata *plat = dev_get_platdata(dev);
+	struct eth_pdata *plat = dev_get_plat(dev);
 	struct rtl8139_priv *priv = dev_get_priv(dev);
 	u32 iobase;