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/bcmstb_spi.c b/drivers/spi/bcmstb_spi.c
index da87476..83ca649 100644
--- a/drivers/spi/bcmstb_spi.c
+++ b/drivers/spi/bcmstb_spi.c
@@ -96,7 +96,7 @@
 
 static int bcmstb_spi_ofdata_to_platdata(struct udevice *bus)
 {
-	struct bcmstb_spi_platdata *plat = dev_get_platdata(bus);
+	struct bcmstb_spi_platdata *plat = dev_get_plat(bus);
 	const void *fdt = gd->fdt_blob;
 	int node = dev_of_offset(bus);
 	int ret = 0;
@@ -159,7 +159,7 @@
 
 static int bcmstb_spi_probe(struct udevice *bus)
 {
-	struct bcmstb_spi_platdata *plat = dev_get_platdata(bus);
+	struct bcmstb_spi_platdata *plat = dev_get_plat(bus);
 	struct bcmstb_spi_priv *priv = dev_get_priv(bus);
 
 	priv->regs = plat->base[HIF_MSPI];