blackfin: bf60x: add board and headers files to support bf609

Board and config header files for bf609-ezkit support.

Signed-off-by: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Sonic Zhang <sonic.adi@gmail.com>
diff --git a/boards.cfg b/boards.cfg
index 7f772a0..136ea0a 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -361,6 +361,7 @@
 bf548-ezkit                  blackfin    blackfin
 bf561-acvilon                blackfin    blackfin
 bf561-ezkit                  blackfin    blackfin
+bf609-ezkit                  blackfin    blackfin
 blackstamp                   blackfin    blackfin
 blackvme                     blackfin    blackfin
 br4                          blackfin    blackfin