Blackfin: adi boards: enable multi serial support by default

Since this only adds less than 3KiB, enable for all ADI boards.

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

include/configs/bfin_adi_common.h

@@ -112,6 +112,10 @@
 #ifndef CONFIG_BAUDRATE
 # define CONFIG_BAUDRATE	57600
 #endif
+#ifndef CONFIG_DEBUG_EARLY_SERIAL
+# define CONFIG_SERIAL_MULTI
+# define CONFIG_SYS_BFIN_UART
+#endif
 
 /*
  * Debug Settings