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/altera_spi.c b/drivers/spi/altera_spi.c
index bca2cfb..b7da09f 100644
--- a/drivers/spi/altera_spi.c
+++ b/drivers/spi/altera_spi.c
@@ -89,7 +89,7 @@
 	struct udevice *bus = dev->parent;
 	struct altera_spi_priv *priv = dev_get_priv(bus);
 	struct altera_spi_regs *const regs = priv->regs;
-	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
+	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
 
 	/* assume spi core configured to do 8 bit transfers */
 	unsigned int bytes = bitlen / 8;
@@ -203,7 +203,7 @@
 	.of_match = altera_spi_ids,
 	.ops	= &altera_spi_ops,
 	.ofdata_to_platdata = altera_spi_ofdata_to_platdata,
-	.platdata_auto	= sizeof(struct altera_spi_platdata),
+	.plat_auto	= sizeof(struct altera_spi_platdata),
 	.priv_auto	= sizeof(struct altera_spi_priv),
 	.probe	= altera_spi_probe,
 };