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/freescale/lx2160a/lx2160a.c b/board/freescale/lx2160a/lx2160a.c
index 0ff987e..457b466 100644
--- a/board/freescale/lx2160a/lx2160a.c
+++ b/board/freescale/lx2160a/lx2160a.c
@@ -64,7 +64,7 @@
 
 U_BOOT_DEVICE(nxp_serial0) = {
 	.name = "serial_pl01x",
-	.platdata = &serial0,
+	.plat = &serial0,
 };
 
 static struct pl01x_serial_platdata serial1 = {
@@ -74,7 +74,7 @@
 
 U_BOOT_DEVICE(nxp_serial1) = {
 	.name = "serial_pl01x",
-	.platdata = &serial1,
+	.plat = &serial1,
 };
 
 int select_i2c_ch_pca9547(u8 ch)