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/block/sandbox.c b/drivers/block/sandbox.c
index e5ef260..12d3200 100644
--- a/drivers/block/sandbox.c
+++ b/drivers/block/sandbox.c
@@ -35,7 +35,7 @@
 				     void *buffer)
 {
 	struct host_block_dev *host_dev = dev_get_platdata(dev);
-	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
+	struct blk_desc *block_dev = dev_get_uclass_plat(dev);
 
 #else
 static unsigned long host_block_read(struct blk_desc *block_dev,
@@ -66,7 +66,7 @@
 				      const void *buffer)
 {
 	struct host_block_dev *host_dev = dev_get_platdata(dev);
-	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
+	struct blk_desc *block_dev = dev_get_uclass_plat(dev);
 #else
 static unsigned long host_block_write(struct blk_desc *block_dev,
 				      unsigned long start, lbaint_t blkcnt,
@@ -202,7 +202,7 @@
 	ret = blk_get_device(IF_TYPE_HOST, devnum, &dev);
 	if (ret)
 		return ret;
-	*blk_devp = dev_get_uclass_platdata(dev);
+	*blk_devp = dev_get_uclass_plat(dev);
 #else
 	struct host_block_dev *host_dev = find_host_device(devnum);
 
@@ -228,7 +228,7 @@
 	.name		= "sandbox_host_blk",
 	.id		= UCLASS_BLK,
 	.ops		= &sandbox_host_blk_ops,
-	.platdata_auto	= sizeof(struct host_block_dev),
+	.plat_auto	= sizeof(struct host_block_dev),
 };
 #else
 U_BOOT_LEGACY_BLK(sandbox_host) = {