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/arch/arm/mach-tegra/board.c b/arch/arm/mach-tegra/board.c
index 03faacb..bf01aa5 100644
--- a/arch/arm/mach-tegra/board.c
+++ b/arch/arm/mach-tegra/board.c
@@ -257,7 +257,7 @@
 }
 
 #if !CONFIG_IS_ENABLED(OF_CONTROL)
-static struct ns16550_platdata ns16550_com1_pdata = {
+static struct ns16550_plat ns16550_com1_pdata = {
 	.base = CONFIG_SYS_NS16550_COM1,
 	.reg_shift = 2,
 	.clock = CONFIG_SYS_NS16550_CLK,