Blackfin: ADI settings: enable silent console support

Very little additional code overhead, and only works when the user sets an
env var ahead of time, so default to on makes sense.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/configs/bfin_adi_common.h

@@ -96,6 +96,7 @@
 #define CONFIG_AUTO_COMPLETE	1
 #define CONFIG_LOADS_ECHO	1
 #define CONFIG_JTAG_CONSOLE
+#define CONFIG_SILENT_CONSOLE
 #ifndef CONFIG_BAUDRATE
 # define CONFIG_BAUDRATE	57600
 #endif