powerpc: mpc5xxx: remove galaxy5200 board 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>
Cc: Eric Millbrandt <emillbrandt@dekaresearch.com>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index c416f3a..1f2320b 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -12,6 +12,7 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+galaxy5200       powerpc     mpc5xxx        -           -           Eric Millbrandt <emillbrandt@dekaresearch.com>
 W7OLMC           powerpc     ppc4xx         -           -           Erik Theisen <etheisen@mindspring.com>
 W7OLMG           powerpc     ppc4xx         -           -           Erik Theisen <etheisen@mindspring.com>
 aev              powerpc     mpc5xxx        -           -