arm: arm925t: remove SX1 board

SX1 does not build properly by itself, is not built
as part of MAKEALL arm or MAKEALL -a arm, and is only
present in Makefile, not boards.cfg. As it also has no
entry in MAINTAINERS, it is orphan and non-functional.
Remove it.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index d0f4716..ed779e2 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -11,7 +11,8 @@
 
 Board	Arch	CPU	removed	    Commit	last known maintainer/contact
 =============================================================================
-TQM85xx	powerpc	MPC85xx	-	  -		Stefan Roese <sr@denx.de>
+SX1	arm	arm925t	-         -
+TQM85xx	powerpc	MPC85xx	d923a5d5  2012-10-04	Stefan Roese <sr@denx.de>
 apollon arm     omap24xx 535c74f  2012-09-18    Kyungmin Park <kyungmin.park@samsung.com>
 tb0229	mips	mips32	3f3110d	  2011-12-12
 rmu	powerpc	MPC850	fb82fd7   2011-12-07	Wolfgang Denk <wd@denx.de>