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/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 261ded0..a83a670 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -3034,15 +3034,14 @@
 }
 
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
-static int conv_of_platdata(struct udevice *dev)
+static int conv_of_plat(struct udevice *dev)
 {
 	struct rockchip_dmc_plat *plat = dev_get_plat(dev);
 	struct dtd_rockchip_rk3399_dmc *dtplat = &plat->dtplat;
 	int ret;
 
-	ret = regmap_init_mem_platdata(dev, dtplat->reg,
-				       ARRAY_SIZE(dtplat->reg) / 2,
-				       &plat->map);
+	ret = regmap_init_mem_plat(dev, dtplat->reg,
+				   ARRAY_SIZE(dtplat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;
 
@@ -3076,7 +3075,7 @@
 	struct rk3399_sdram_params *params =
 					(void *)dtplat->rockchip_sdram_params;
 
-	ret = conv_of_platdata(dev);
+	ret = conv_of_plat(dev);
 	if (ret)
 		return ret;
 #endif