dm: treewide: Rename ..._platdata variables to just ..._plat

Try to maintain some consistency between these variables by using _plat as
a suffix for them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spi/omap3_spi.c b/drivers/spi/omap3_spi.c
index 0594a9c..78e2a25 100644
--- a/drivers/spi/omap3_spi.c
+++ b/drivers/spi/omap3_spi.c
@@ -378,7 +378,7 @@
 {
 	struct udevice *bus = dev->parent;
 	struct omap3_spi_priv *priv = dev_get_priv(bus);
-	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
+	struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
 
 	priv->cs = slave_plat->cs;
 	priv->freq = slave_plat->max_hz;
@@ -402,7 +402,7 @@
 {
 	struct udevice *bus = dev->parent;
 	struct omap3_spi_priv *priv = dev_get_priv(bus);
-	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
+	struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
 
 	priv->cs = slave_plat->cs;
 	priv->wordlen = wordlen;