ARM: remove dkb board support

This is still a non-generic board.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Lei Wen <leiwen@marvell.com>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 0fc6ac7..d206251 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -12,6 +12,7 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+dkb              arm         arm926ejs      -           -           Lei Wen <leiwen@marvell.com>
 jadecpu          arm         arm926ejs      -           -           Matthias Weisser <weisserm@arcor.de>
 icecube_5200     powerpc     mpc5xxx        37b608a5    2015-01-23  Wolfgang Denk <wd@denx.de>
 Lite5200         powerpc     mpc5xxx        37b608a5    2015-01-23