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/ti/davinci_emac.c b/drivers/net/ti/davinci_emac.c
index 9cf7e6c..bfe1b84 100644
--- a/drivers/net/ti/davinci_emac.c
+++ b/drivers/net/ti/davinci_emac.c
@@ -112,7 +112,7 @@
 
 static int davinci_emac_write_hwaddr(struct udevice *dev)
 {
-	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct eth_pdata *pdata = dev_get_plat(dev);
 	unsigned long		mac_hi;
 	unsigned long		mac_lo;