treewide: Try to avoid the preprocessor with OF_REAL

Convert some of these occurences to C code, where it is easy to do. This
should help encourage this approach to be used in new code.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/ram/rockchip/sdram_rk3288.c b/drivers/ram/rockchip/sdram_rk3288.c
index 2cb034f..f3e4a28 100644
--- a/drivers/ram/rockchip/sdram_rk3288.c
+++ b/drivers/ram/rockchip/sdram_rk3288.c
@@ -973,10 +973,12 @@
 
 static int rk3288_dmc_of_to_plat(struct udevice *dev)
 {
-#if CONFIG_IS_ENABLED(OF_REAL)
 	struct rk3288_sdram_params *params = dev_get_plat(dev);
 	int ret;
 
+	if (!CONFIG_IS_ENABLED(OF_REAL))
+		return 0;
+
 	/* Rk3288 supports dual-channel, set default channel num to 2 */
 	params->num_channels = 2;
 	ret = dev_read_u32_array(dev, "rockchip,pctl-timing",
@@ -1008,7 +1010,6 @@
 	ret = regmap_init_mem(dev_ofnode(dev), &params->map);
 	if (ret)
 		return ret;
-#endif
 
 	return 0;
 }