MIPS: remove broken "tb0229" board

The "tb0229" board has long been unmaintained, and is broken.
Remove it.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 08e5a9e..4b5558d 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -11,9 +11,10 @@
 
 Board	Arch	CPU	removed	    Commit	last known maintainer/contact
 =============================================================================
-rmu	powerpc	MPC850	-	  2011-12-07	Wolfgang Denk <wd@denx.de>
-OXC	powerpc	MPC8240	-	  2011-12-07
-BAB7xx	powerpc	MPC740/MPC750  -  2011-12-07	Frank Gottschling <fgottschling@eltec.de>
+tb0229	mips	mips32	-	  2011-12-12
+rmu	powerpc	MPC850	fb82fd7   2011-12-07	Wolfgang Denk <wd@denx.de>
+OXC	powerpc	MPC8240	309a292   2011-12-07
+BAB7xx	powerpc	MPC740/MPC750 c53043b 2011-12-07 Frank Gottschling <fgottschling@eltec.de>
 xm250   arm     pxa     c746cdd   2011-25-11
 pleb2   arm     pxa     b185a1c   2011-25-11
 cradle  arm     pxa     4e24f8a   2011-25-11    Kyle Harris <kharris@nexus-tech.net>