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/board/davinci/da8xxevm/omapl138_lcdk.c b/board/davinci/da8xxevm/omapl138_lcdk.c
index 6bab7b1..cdfe805 100644
--- a/board/davinci/da8xxevm/omapl138_lcdk.c
+++ b/board/davinci/da8xxevm/omapl138_lcdk.c
@@ -365,7 +365,7 @@
 
 U_BOOT_DEVICE(omapl138_uart) = {
 	.name = "ns16550_serial",
-	.platdata = &serial_pdata,
+	.plat = &serial_pdata,
 };
 
 static const struct davinci_mmc_plat mmc_platdata = {
@@ -381,7 +381,7 @@
 };
 U_BOOT_DEVICE(omapl138_mmc) = {
 	.name = "ti_da830_mmc",
-	.platdata = &mmc_platdata,
+	.plat = &mmc_platdata,
 };
 
 void spl_board_init(void)