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/mxc_spi.c b/drivers/spi/mxc_spi.c
index af476c8..c5ffad8 100644
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -69,7 +69,7 @@
 {
 #if CONFIG_IS_ENABLED(DM_SPI)
 	struct udevice *dev = mxcs->dev;
-	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
+	struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
 
 	u32 cs = slave_plat->cs;
 
@@ -87,7 +87,7 @@
 {
 #if CONFIG_IS_ENABLED(DM_SPI)
 	struct udevice *dev = mxcs->dev;
-	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
+	struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
 
 	u32 cs = slave_plat->cs;
 
@@ -559,7 +559,7 @@
 static int mxc_spi_claim_bus(struct udevice *dev)
 {
 	struct mxc_spi_slave *mxcs = dev_get_plat(dev->parent);
-	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
+	struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
 
 	mxcs->dev = dev;