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/ram/rockchip/dmc-rk3368.c b/drivers/ram/rockchip/dmc-rk3368.c
index 0e677f3..a9d0518 100644
--- a/drivers/ram/rockchip/dmc-rk3368.c
+++ b/drivers/ram/rockchip/dmc-rk3368.c
@@ -895,7 +895,7 @@
 }
 
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
-static int conv_of_platdata(struct udevice *dev)
+static int conv_of_plat(struct udevice *dev)
 {
 	struct rk3368_sdram_params *plat = dev_get_plat(dev);
 	struct dtd_rockchip_rk3368_dmc *of_plat = &plat->of_plat;
@@ -923,7 +923,7 @@
 	struct dram_info *priv = dev_get_priv(dev);
 
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
-	ret = conv_of_platdata(dev);
+	ret = conv_of_plat(dev);
 	if (ret)
 		return ret;
 #endif