mpc8260: remove ppmc8260 board support

This board is still a non-generic board.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Brad Kemp <Brad.Kemp@seranoa.com>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 5b71bc9..0845651 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -12,6 +12,7 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+ppmc8260         powerpc     mpc8260        -           -           Brad Kemp <Brad.Kemp@seranoa.com>
 sacsng           powerpc     mpc8260        -           -           Jerry Van Baren <gerald.vanbaren@smiths-aerospace.com>
 cogent_mpc8260   powerpc     mpc8260        -           -           Murray Jensen <Murray.Jensen@csiro.au>
 cogent_8xx       powerpc     mpc8xx         -           -           Murray Jensen <Murray.Jensen@csiro.au>