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/arch/m68k/config.mk b/arch/m68k/config.mk
index 749c389..863f3dd 100644
--- a/arch/m68k/config.mk
+++ b/arch/m68k/config.mk
@@ -24,7 +24,7 @@
 CROSS_COMPILE ?= m68k-elf-
 
 clibdir = $(shell dirname `$(CC) $(CFLAGS) -print-file-name=libc.a`)
-STANDALONE_LOAD_ADDR = 0x20000 -L $(clibdir)
+CONFIG_STANDALONE_LOAD_ADDR ?= 0x20000 -L $(clibdir)
 
 PLATFORM_CPPFLAGS += -DCONFIG_M68K -D__M68K__
 PLATFORM_LDFLAGS  += -n