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/fm/eth.c b/drivers/net/fm/eth.c
index f5fb513..02ccf1e 100644
--- a/drivers/net/fm/eth.c
+++ b/drivers/net/fm/eth.c
@@ -472,7 +472,7 @@
 #ifndef CONFIG_DM_ETH
 	struct fm_eth *fm_eth = dev->priv;
 #else
-	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct eth_pdata *pdata = dev_get_plat(dev);
 	struct fm_eth *fm_eth = dev_get_priv(dev);
 #endif
 	unsigned char *enetaddr;