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/serial/serial_omap.c b/drivers/serial/serial_omap.c
index 296c5fd..26e03b8 100644
--- a/drivers/serial/serial_omap.c
+++ b/drivers/serial/serial_omap.c
@@ -101,7 +101,7 @@
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 static int omap_serial_ofdata_to_platdata(struct udevice *dev)
 {
-	struct ns16550_platdata *plat = dev->platdata;
+	struct ns16550_platdata *plat = dev->plat;
 	fdt_addr_t addr;
 	struct clk clk;
 	int err;
@@ -158,7 +158,7 @@
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 	.of_match = omap_serial_ids,
 	.ofdata_to_platdata = omap_serial_ofdata_to_platdata,
-	.platdata_auto	= sizeof(struct ns16550_platdata),
+	.plat_auto	= sizeof(struct ns16550_platdata),
 #endif
 	.priv_auto	= sizeof(struct NS16550),
 	.probe = ns16550_serial_probe,