powerpc: mpc5xx: remove cmi_mpc5xx support

This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 438ac8c..d97e82f 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -12,6 +12,7 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+cmi_mpc5xx       powerpc     mpc5xx         -           -
 zeus             powerpc     ppc4xx         -           -           Stefan Roese <sr@denx.de>
 sbc405           powerpc     ppc4xx         -           -
 pcs440ep         powerpc     ppc4xx         -           -           Stefan Roese <sr@denx.de>