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/phy/phy-bcm-sr-pcie.c b/drivers/phy/phy-bcm-sr-pcie.c
index 9f7c983..f0e7953 100644
--- a/drivers/phy/phy-bcm-sr-pcie.c
+++ b/drivers/phy/phy-bcm-sr-pcie.c
@@ -172,6 +172,6 @@
 	.probe = sr_pcie_phy_probe,
 	.of_match = sr_pcie_phy_match_table,
 	.ops = &sr_pcie_phy_ops,
-	.platdata_auto	= sizeof(struct sr_pcie_phy_core),
+	.plat_auto	= sizeof(struct sr_pcie_phy_core),
 	.priv_auto	= sizeof(struct sr_pcie_phy_core),
 };