83xx: define CONFIG_OF_STDOUT_VIA_ALIAS for the MPC837XERDB boards

This is primarily for the early console support.
Signed-off-by: NAnton Vorontsov <avorontsov@ru.mvista.com>

include/configs/MPC837XERDB.h

@@ -338,6 +338,7 @@
 /* Pass open firmware flat tree */
 #define CONFIG_OF_LIBFDT	1
 #define CONFIG_OF_BOARD_SETUP	1
+#define CONFIG_OF_STDOUT_VIA_ALIAS 1
 
 /* I2C */
 #define CONFIG_HARD_I2C		/* I2C with hardware support */