PPC: remove dead boards (AMX860, c2mon, ETX094, IAD210, LANTEC, SCM)

These boards have long reached EOL, and there has been no indication
of any active users of such hardware for years.  Get rid of the dead
weight.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Wolfgang Grandegger <wg@denx.de>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index ed779e2..2b868e6 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -11,6 +11,12 @@
 
 Board	Arch	CPU	removed	    Commit	last known maintainer/contact
 =============================================================================
+AMX860	powerpc	mpc860	-	  -		Wolfgang Denk <wd@denx.de>
+c2mon	powerpc	mpc855	-	  -		Wolfgang Denk <wd@denx.de>
+ETX094	powerpc	mpc850	-	  -		Wolfgang Denk <wd@denx.de>
+IAD210	powerpc	mpc860	-	  -		-
+LANTEC	powerpc	mpc850	-	  -		Wolfgang Denk <wd@denx.de>
+SCM	powerpc	mpc8260	-	  -		Wolfgang Grandegger <wg@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>