arm: Remove IXP425 boards pdnb3 and scpu

Remove Prodrive pdnb3 board (including the scpu variant) support
from mainline. As its unmaintained and not needed any more for
quite some time.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Martijn de Gouw <martijn.de.gouw@prodrive.nl>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 0f9a486..151dbdf 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -11,7 +11,9 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
-omap1510inn      arm         arm925t        -           -           Kshitij Gupta <kshitij@ti.com>
+pdnb3            arm         ixp            -           2013-09-24  Stefan Roese <sr@denx.de>
+scpu             arm         ixp            -           2013-09-24  Stefan Roese <sr@denx.de>
+omap1510inn      arm         arm925t        0610a16     2013-09-23  Kshitij Gupta <kshitij@ti.com>
 CANBT            powerpc     405CR          fb8f4fd     2013-08-07  Matthias Fuchs <matthias.fuchs@esd.eu>
 Alaska8220       powerpc     mpc8220        d6ed322     2013-05-11
 Yukon8220        powerpc     mpc8220        d6ed322     2013-05-11