mx7_common: Put display board info config into board file

CONFIG_DISPLAY_BOARDINFO should not be placed in mx7_common
because some boards might need a different config such as
CONFIG_DISPLAY_BOARDINFO_LATE. Move it to the board file
instead.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
diff --git a/include/configs/mx7dsabresd.h b/include/configs/mx7dsabresd.h
index cfaf59b..822d81f 100644
--- a/include/configs/mx7dsabresd.h
+++ b/include/configs/mx7dsabresd.h
@@ -22,6 +22,8 @@
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_BOARD_LATE_INIT
 
+#define CONFIG_DISPLAY_BOARDINFO
+
 /* Uncomment to enable secure boot support */
 /* #define CONFIG_SECURE_BOOT */
 #define CONFIG_CSF_SIZE			0x4000