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/MAINTAINERS b/MAINTAINERS
index 439c1b8..e9db278 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -928,6 +928,7 @@
 	CM-BF527	BF527
 	CM-BF533	BF533
 	CM-BF537E	BF537
+	CM-BF537U	BF537
 	CM-BF548	BF548
 	CM-BF561	BF561
 	TCM-BF537	BF537