powerpc: ppc4xx: remove PPChameleonEVB, CATcenter boards

These boards are still non-generic boards.

It is a good thing that we can drop board-specific hack code
from drivers/mtd/nand/nand_base.c

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Stefan Roese <sr@denx.de>
Cc: Andrea "llandre" Marson <andrea.marson@dave-tech.it>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 719b970..976fca1 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -12,6 +12,8 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+CATcenter        powerpc     ppc4xx         -           -
+PPChameleonEVB   powerpc     ppc4xx         -           -           Andrea "llandre" Marson <andrea.marson@dave-tech.it>
 P2020DS          powerpc     mpc85xx        -           -
 P2020COME        powerpc     mpc85xx        -           -           Ira W. Snyder <iws@ovro.caltech.edu>
 P2020RDB         powerpc     mpc85xx        -           -           Poonam Aggrwal <poonam.aggrwal@freescale.com>