powerpc: mpc5xxx: remove aev, TB5200 board support

They have 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 668431c..e3c4e2c 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -12,6 +12,8 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+aev              powerpc     mpc5xxx        -           -
+TB5200           powerpc     mpc5xxx        -           -
 JSE              powerpc     ppc4xx         -           -           Stephen Williams <steve@icarus.com>
 BC3450           powerpc     mpc5xxx        -           -
 hawkboard        arm         arm926ejs      cb957cda    2015-02-24  Syed Mohammed Khasim <sm.khasim@gmail.com>:Sughosh Ganu <urwithsughosh@gmail.com>