mpc83xx: enable command line autocompletion

because it's convenient.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/MPC837XERDB.h b/include/configs/MPC837XERDB.h
index ca60272..97a05a2 100644
--- a/include/configs/MPC837XERDB.h
+++ b/include/configs/MPC837XERDB.h
@@ -508,6 +508,7 @@
 #endif
 
 #define CONFIG_CMDLINE_EDITING	1	/* add command line history */
+#define CONFIG_AUTO_COMPLETE		/* add autocompletion support   */
 
 #undef CONFIG_WATCHDOG		/* watchdog disabled */