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/zynq_spi.c b/drivers/spi/zynq_spi.c
index f18b9e1..b400959 100644
--- a/drivers/spi/zynq_spi.c
+++ b/drivers/spi/zynq_spi.c
@@ -121,7 +121,7 @@
 
 static int zynq_spi_probe(struct udevice *bus)
 {
-	struct zynq_spi_platdata *plat = dev_get_platdata(bus);
+	struct zynq_spi_platdata *plat = dev_get_plat(bus);
 	struct zynq_spi_priv *priv = dev_get_priv(bus);
 	struct clk clk;
 	unsigned long clock;