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/thermal/imx_tmu.c b/drivers/thermal/imx_tmu.c
index 4c83717..77e3b3c 100644
--- a/drivers/thermal/imx_tmu.c
+++ b/drivers/thermal/imx_tmu.c
@@ -463,6 +463,6 @@
 	.of_match = imx_tmu_ids,
 	.bind = imx_tmu_bind,
 	.probe	= imx_tmu_probe,
-	.platdata_auto	= sizeof(struct imx_tmu_plat),
+	.plat_auto	= sizeof(struct imx_tmu_plat),
 	.flags  = DM_FLAG_PRE_RELOC,
 };