Blackfin: enable IP defrag for ADI boards

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

include/configs/bfin_adi_common.h

@@ -248,6 +248,7 @@
 #   define CONFIG_SYS_AUTOLOAD "no"
 #  endif
 # endif
+# define CONFIG_IP_DEFRAG
 # define CONFIG_NET_RETRY_COUNT 20
 #endif