MPC7xx: remove obsolete "BAB7xx" board

The BAB7xx boards are almost deceased.  They cause build warnings, an
it's not worth the effort to fix these.  Remove the dead body.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Frank Gottschling <fgottschling@eltec.de>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 07f0024..d3760cc 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -11,6 +11,7 @@
 
 Board	Arch	CPU	removed	    Commit	last known maintainer/contact
 =============================================================================
+BAB7xx	powerpc	MPC740/MPC750  -  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>