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/spi/rk_spi.c b/drivers/spi/rk_spi.c
index 93d125e..63ed0b2 100644
--- a/drivers/spi/rk_spi.c
+++ b/drivers/spi/rk_spi.c
@@ -195,7 +195,7 @@
 static int rockchip_spi_ofdata_to_platdata(struct udevice *bus)
 {
 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
-	struct rockchip_spi_platdata *plat = dev_get_platdata(bus);
+	struct rockchip_spi_platdata *plat = dev_get_plat(bus);
 	struct rockchip_spi_priv *priv = dev_get_priv(bus);
 	int ret;
 
@@ -253,7 +253,7 @@
 
 static int rockchip_spi_probe(struct udevice *bus)
 {
-	struct rockchip_spi_platdata *plat = dev_get_platdata(bus);
+	struct rockchip_spi_platdata *plat = dev_get_plat(bus);
 	struct rockchip_spi_priv *priv = dev_get_priv(bus);
 	int ret;