powerpc: mpc5xxx: PM520 board support

This board is still a non-generic board.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Josef Wagner <Wagner@Microsys.de>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 0c4dbd0..a8eca4b 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -12,6 +12,7 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+PM520            powerpc     mpc5xxx        -           -           Josef Wagner <Wagner@Microsys.de>
 Total5200        powerpc     mpc5xxx        -           -
 CATcenter        powerpc     ppc4xx         -           -
 PPChameleonEVB   powerpc     ppc4xx         -           -           Andrea "llandre" Marson <andrea.marson@dave-tech.it>