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/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
index 018e8c5..ea44443 100644
--- a/drivers/mtd/spi/Kconfig
+++ b/drivers/mtd/spi/Kconfig
@@ -63,7 +63,7 @@
 	  to handle the common case when only a single serial
 	  flash is present on the system.
 	  Not used for boot with device tree; the SPI driver reads
-	  speed and mode from platdata values computed from
+	  speed and mode from plat values computed from
 	  available node.
 
 config SF_DEFAULT_SPEED
@@ -75,7 +75,7 @@
 	  to handle the common case when only a single serial
 	  flash is present on the system.
 	  Not used for boot with device tree; the SPI driver reads
-	  speed and mode from platdata values computed from
+	  speed and mode from plat values computed from
 	  available node.
 
 if SPI_FLASH