arm: Remove OMAP2420H4 and all omap24xx support

The omap2420H4 was the only mainline omap24xx board.  Prior to being
fixed by Jon Hunter in time for v2013.04 it had been functionally broken
for a very long time.  Remove this board as there's not been interest in
it in U-Boot for quite a long time.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 9223f6e..a0f1fa3 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -96,3 +96,4 @@
 CPCI440          powerpc     440GP          b568fd2     2007-12-27  Matthias Fuchs <matthias.fuchs@esd-electronics.com>
 PCIPPC2          powerpc     MPC740/MPC750  7c9e89b     2013-02-07  Wolfgang Denk <wd@denx.de>
 PCIPPC6	powerpc	MPC740/MPC750 -	  -		Wolfgang Denk <wd@denx.de>
+omap2420h4       arm         omap24xx       -           2013-06-04  Richard Woodruff <r-woodruff2@ti.com>