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/net/designware.c b/drivers/net/designware.c
index 32b3fc8..83b31fa 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -740,7 +740,7 @@
 #ifdef CONFIG_DM_PCI
 	/*
 	 * If we are on PCI bus, either directly attached to a PCI root port,
-	 * or via a PCI bridge, fill in platdata before we probe the hardware.
+	 * or via a PCI bridge, fill in plat before we probe the hardware.
 	 */
 	if (device_is_on_pci_bus(dev)) {
 		dm_pci_read_config32(dev, PCI_BASE_ADDRESS_0, &iobase);
@@ -874,7 +874,7 @@
 	.remove	= designware_eth_remove,
 	.ops	= &designware_eth_ops,
 	.priv_auto	= sizeof(struct dw_eth_dev),
-	.platdata_auto	= sizeof(struct dw_eth_pdata),
+	.plat_auto	= sizeof(struct dw_eth_pdata),
 	.flags = DM_FLAG_ALLOC_PRIV_DMA,
 };