image: Drop IMAGE_OF_SYSTEM_SETUP

This is not needed with Kconfig, since we can use IS_ENABLED() easily
enough. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/common/image-fdt.c b/common/image-fdt.c
index 2be6d19..abea17b 100644
--- a/common/image-fdt.c
+++ b/common/image-fdt.c
@@ -597,7 +597,7 @@
 			}
 		}
 	}
-	if (IMAGE_OF_SYSTEM_SETUP) {
+	if (IS_ENABLED(CONFIG_OF_SYSTEM_SETUP)) {
 		fdt_ret = ft_system_setup(blob, gd->bd);
 		if (fdt_ret) {
 			printf("ERROR: system-specific fdt fixup failed: %s\n",
diff --git a/include/image.h b/include/image.h
index e1e4148..e190f59 100644
--- a/include/image.h
+++ b/include/image.h
@@ -49,12 +49,6 @@
 #include <fdt_support.h>
 #endif /* FIT */
 
-#ifdef CONFIG_OF_SYSTEM_SETUP
-# define IMAGE_OF_SYSTEM_SETUP	1
-#else
-# define IMAGE_OF_SYSTEM_SETUP	0
-#endif
-
 extern ulong image_load_addr;		/* Default Load Address */
 extern ulong image_save_addr;		/* Default Save Address */
 extern ulong image_save_size;		/* Default Save Size */