push LOAD_ADDR out to arch mk files

Rather than maintain/extend the current ifeq($(ARCH)) mess that exists in
the standalone Makefile, push the setting up of LOAD_ADDR out to the arch
config.mk (and rename to STANDALONE_LOAD_ADDR in the process).  This keeps
the common code clean and lets the arch do whatever crazy crap it wants in
its own area.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/lib_nios/config.mk b/lib_nios/config.mk
index 3ed7170..d48aa6d 100644
--- a/lib_nios/config.mk
+++ b/lib_nios/config.mk
@@ -24,4 +24,6 @@
 
 CROSS_COMPILE ?= nios-elf-
 
+STANDALONE_LOAD_ADDR = 0x00800000 -L $(gcclibdir)/m32 -T nios.lds
+
 PLATFORM_CPPFLAGS += -m32 -DCONFIG_NIOS -D__NIOS__ -ffixed-g7 -gstabs