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/mmc/sandbox_mmc.c b/drivers/mmc/sandbox_mmc.c
index 17c6cea..8a2391d 100644
--- a/drivers/mmc/sandbox_mmc.c
+++ b/drivers/mmc/sandbox_mmc.c
@@ -108,14 +108,14 @@
 
 int sandbox_mmc_probe(struct udevice *dev)
 {
-	struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
+	struct sandbox_mmc_plat *plat = dev_get_plat(dev);
 
 	return mmc_init(&plat->mmc);
 }
 
 int sandbox_mmc_bind(struct udevice *dev)
 {
-	struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
+	struct sandbox_mmc_plat *plat = dev_get_plat(dev);
 	struct mmc_config *cfg = &plat->cfg;
 
 	cfg->name = dev->name;