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/timer/altera_timer.c b/drivers/timer/altera_timer.c
index 4579717..1daa0ea 100644
--- a/drivers/timer/altera_timer.c
+++ b/drivers/timer/altera_timer.c
@@ -65,7 +65,7 @@
 
 static int altera_timer_ofdata_to_platdata(struct udevice *dev)
 {
-	struct altera_timer_platdata *plat = dev_get_platdata(dev);
+	struct altera_timer_platdata *plat = dev_get_plat(dev);
 
 	plat->regs = map_physmem(dev_read_addr(dev),
 				 sizeof(struct altera_timer_regs),