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/virtio/virtio_net.c b/drivers/virtio/virtio_net.c
index e1831cf..b32ce3c 100644
--- a/drivers/virtio/virtio_net.c
+++ b/drivers/virtio/virtio_net.c
@@ -234,6 +234,6 @@
 	.remove = virtio_reset,
 	.ops	= &virtio_net_ops,
 	.priv_auto	= sizeof(struct virtio_net_priv),
-	.platdata_auto	= sizeof(struct eth_pdata),
+	.plat_auto	= sizeof(struct eth_pdata),
 	.flags	= DM_FLAG_ACTIVE_DMA,
 };