Make STANDALONE_LOAD_ADDR configurable per board

Rename STANDALONE_LOAD_ADDR into CONFIG_STANDALONE_LOAD_ADDR
and allow that the architecture-specific default value gets
overwritten by defining the value in the board header file.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: Tsi Chung Liew <tsi-chung.liew@freescale.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/include/configs/omap2420h4.h b/include/configs/omap2420h4.h
index 7161ab1..2888c7b 100644
--- a/include/configs/omap2420h4.h
+++ b/include/configs/omap2420h4.h
@@ -38,6 +38,8 @@
 /*#define CONFIG_APTIX           1    #* define if on APTIX test chip */
 /*#define CONFIG_VIRTIO          1    #* Using Virtio simulator */
 
+#define CONFIG_STANDALONE_LOAD_ADDR	0x80300000
+
 /* Clock config to target*/
 #define PRCM_CONFIG_II	1
 /* #define PRCM_CONFIG_III		1 */