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/octeontx2/rvu_pf.c b/drivers/net/octeontx2/rvu_pf.c
index b000b91..246fca2 100644
--- a/drivers/net/octeontx2/rvu_pf.c
+++ b/drivers/net/octeontx2/rvu_pf.c
@@ -105,7 +105,7 @@
 	.remove = rvu_pf_remove,
 	.ops    = &nix_eth_ops,
 	.priv_auto	= sizeof(struct rvu_pf),
-	.platdata_auto	= sizeof(struct eth_pdata),
+	.plat_auto	= sizeof(struct eth_pdata),
 };
 
 static struct pci_device_id rvu_pf_supported[] = {