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/spi/pl022_spi.c b/drivers/spi/pl022_spi.c
index e9fd618..712385b 100644
--- a/drivers/spi/pl022_spi.c
+++ b/drivers/spi/pl022_spi.c
@@ -288,7 +288,7 @@
 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 static int pl022_spi_ofdata_to_platdata(struct udevice *bus)
 {
-	struct pl022_spi_pdata *plat = bus->platdata;
+	struct pl022_spi_pdata *plat = bus->plat;
 	const void *fdt = gd->fdt_blob;
 	int node = dev_of_offset(bus);
 	struct clk clkdev;
@@ -319,7 +319,7 @@
 	.ofdata_to_platdata = pl022_spi_ofdata_to_platdata,
 #endif
 	.ops    = &pl022_spi_ops,
-	.platdata_auto	= sizeof(struct pl022_spi_pdata),
+	.plat_auto	= sizeof(struct pl022_spi_pdata),
 	.priv_auto	= sizeof(struct pl022_spi_slave),
 	.probe  = pl022_spi_probe,
 };