treewide: Use OF_REAL instead of !OF_PLATDATA

Now that we have a 'positive' Kconfig option, use this instead of the
negative one, which is harder to understand.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rk3399/syscon_rk3399.c b/arch/arm/mach-rockchip/rk3399/syscon_rk3399.c
index b360ca7..2b5746c 100644
--- a/arch/arm/mach-rockchip/rk3399/syscon_rk3399.c
+++ b/arch/arm/mach-rockchip/rk3399/syscon_rk3399.c
@@ -21,7 +21,7 @@
 U_BOOT_DRIVER(syscon_rk3399) = {
 	.name = "rk3399_syscon",
 	.id = UCLASS_SYSCON,
-#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+#if CONFIG_IS_ENABLED(OF_REAL)
 	.bind = dm_scan_fdt_dev,
 #endif
 	.of_match = rk3399_syscon_ids,