dm: treewide: Rename 'platdata' variables to just 'plat'

We use 'priv' for private data but often use 'platdata' for platform data.
We can't really use 'pdata' since that is ambiguous (it could mean private
or platform data).

Rename some of the latter variables to end with 'plat' for consistency.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 269f31a..53eabc9 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -321,7 +321,7 @@
 	device_find_first_child(mmc->dev, &dev);
 	if (!dev)
 		return NULL;
-	desc = dev_get_uclass_platdata(dev);
+	desc = dev_get_uclass_plat(dev);
 
 	return desc;
 }
@@ -399,7 +399,7 @@
 		debug("Cannot create block device\n");
 		return ret;
 	}
-	bdesc = dev_get_uclass_platdata(bdev);
+	bdesc = dev_get_uclass_plat(bdev);
 	mmc->cfg = cfg;
 	mmc->priv = dev;
 
@@ -435,7 +435,7 @@
 {
 	struct udevice *mmc_dev = dev_get_parent(bdev);
 	struct mmc *mmc = mmc_get_mmc_dev(mmc_dev);
-	struct blk_desc *desc = dev_get_uclass_platdata(bdev);
+	struct blk_desc *desc = dev_get_uclass_plat(bdev);
 	int ret;
 
 	if (desc->hwpart == hwpart)