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/doc/driver-model/usb-info.rst b/doc/driver-model/usb-info.rst
index 5f7cbfc..ec8f317 100644
--- a/doc/driver-model/usb-info.rst
+++ b/doc/driver-model/usb-info.rst
@@ -43,7 +43,7 @@
 		.probe = tegra_ehci_usb_probe,
 		.remove = tegra_ehci_usb_remove,
 		.ops	= &ehci_usb_ops,
-		.platdata_auto = sizeof(struct usb_platdata),
+		.plat_auto = sizeof(struct usb_platdata),
 		.priv_auto = sizeof(struct fdt_usb),
 		.flags	= DM_FLAG_ALLOC_PRIV_DMA,
 	};
@@ -100,7 +100,7 @@
 
 - struct usb_dev_platdata:
 	This holds platform data for a device. You can access it for a
-	device 'dev' with dev_get_parent_platdata(dev). It holds the device
+	device 'dev' with dev_get_parent_plat(dev). It holds the device
 	address and speed - anything that can be determined before the device
 	driver is actually set up. When probing the bus this structure is
 	used to provide essential information to the device driver.