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/boards.cfg b/boards.cfg
index 2f90dbf..fd8db61 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -289,6 +289,7 @@
 dnp5370                      blackfin    blackfin
 ibf-dsp561                   blackfin    blackfin
 ip04                         blackfin    blackfin
+pr1                          blackfin    blackfin
 tcm-bf518                    blackfin    blackfin
 tcm-bf537                    blackfin    blackfin
 M52277EVB                    m68k        mcf5227x    m52277evb           freescale      -           M52277EVB:SYS_SPANSION_BOOT,SYS_TEXT_BASE=0x00000000