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/mmc/rockchip_sdhci.c b/drivers/mmc/rockchip_sdhci.c
index 131c976..427d41e 100644
--- a/drivers/mmc/rockchip_sdhci.c
+++ b/drivers/mmc/rockchip_sdhci.c
@@ -115,5 +115,5 @@
 	.bind		= rockchip_sdhci_bind,
 	.probe		= arasan_sdhci_probe,
 	.priv_auto	= sizeof(struct rockchip_sdhc),
-	.platdata_auto	= sizeof(struct rockchip_sdhc_plat),
+	.plat_auto	= sizeof(struct rockchip_sdhc_plat),
 };