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/fsl-mc/mc.c b/drivers/net/fsl-mc/mc.c
index 84db6be..4b0c0ed 100644
--- a/drivers/net/fsl-mc/mc.c
+++ b/drivers/net/fsl-mc/mc.c
@@ -185,7 +185,7 @@
 			     enum mc_fixup_type type)
 {
 #ifdef CONFIG_DM_ETH
-	struct eth_pdata *plat = dev_get_platdata(eth_dev);
+	struct eth_pdata *plat = dev_get_plat(eth_dev);
 	unsigned char *enetaddr = plat->enetaddr;
 	int eth_index = eth_dev->seq;
 #else