Blackfin: cm-bf537u: new board port

The CM-BF537U is similar to the CM-BF537E module, but enough to need its
own board port.

Signed-off-by: Harald Krapfenbauer <Harald.Krapfenbauer@bluetechnix.at>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/Makefile b/Makefile
index df22bff..0449a5b 100644
--- a/Makefile
+++ b/Makefile
@@ -3551,7 +3551,7 @@
 	bf537-pnav bf537-stamp bf538f-ezkit bf548-ezkit bf561-ezkit
 
 # Bluetechnix tinyboards
-BFIN_BOARDS += cm-bf527 cm-bf533 cm-bf537e cm-bf548 cm-bf561 tcm-bf537
+BFIN_BOARDS += cm-bf527 cm-bf533 cm-bf537e cm-bf537u cm-bf548 cm-bf561 tcm-bf537
 
 # Misc third party boards
 BFIN_BOARDS += bf537-minotaur bf537-srv1 blackstamp