configs: ls1012afrwy: fix wrong env of board

Fix wrong environment variable of board for ls1012afrwy

Signed-off-by: Biwen Li <biwen.li@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/include/configs/ls1012afrwy.h b/include/configs/ls1012afrwy.h
index 6ea524c..44b467a 100644
--- a/include/configs/ls1012afrwy.h
+++ b/include/configs/ls1012afrwy.h
@@ -8,6 +8,9 @@
 
 #include "ls1012a_common.h"
 
+#undef CONFIG_SYS_BOARD
+#define CONFIG_SYS_BOARD "ls1012afrwy"
+
 /* Board Rev*/
 #define BOARD_REV_A_B			0x0
 #define BOARD_REV_C			0x00080000