m28evk: drop duplicated definition of CONFIG_OF_LIBFDT

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/include/configs/m28evk.h b/include/configs/m28evk.h
index 6cefaa4..156af27 100644
--- a/include/configs/m28evk.h
+++ b/include/configs/m28evk.h
@@ -43,8 +43,6 @@
 #define	CONFIG_ARCH_CPU_INIT
 #define	CONFIG_ARCH_MISC_INIT
 
-#define CONFIG_OF_LIBFDT
-
 /*
  * SPL
  */