microblaze: Remove CONFIG_LIBFDT due to error in common files

include/configs/ml401.h

@@ -277,6 +277,5 @@
 					"1m(romfs),1m(cramfs),-(jffs2)\0"
 
 #define CONFIG_CMDLINE_EDITING
-#define CONFIG_OF_LIBFDT	1
 
 #endif	/* __CONFIG_H */

include/configs/xupv2p.h

@@ -222,6 +222,5 @@
 #endif
 
 #define CONFIG_CMDLINE_EDITING
-#define CONFIG_OF_LIBFDT	1 /* flat device tree */
 
 #endif	/* __CONFIG_H */