Blackfin: pr1: new board port

This add support for the PR1 Appliance - Asterisk based ISDN PRI PBX.
This board is Blackfin BF537 based.  The schematics are not fully opened.

Signed-off-by: Dimitar Penev <dpn@switchfin.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 8c4fe2d..4451ecd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1162,6 +1162,10 @@
 
 	bf525-ucr2	BF525
 
+Dimitar Penev <dpn@switchfin.org>
+
+	PR1 Appliance	BF537
+
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