The call to SYSTEM_MAP assumes that the u-boot output is in $PWD when
it really should be in $(obj).  This fixes building out of tree.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
                $(SUBDIR_TOOLS) $(OBJS) $(LIBBOARD) $(LIBS) $(LDSCRIPT) $(obj)u-boot.lds
                $(GEN_UBOOT)
 ifeq ($(CONFIG_KALLSYMS),y)
-               smap=`$(call SYSTEM_MAP,u-boot) | \
+               smap=`$(call SYSTEM_MAP,$(obj)u-boot) | \
                        awk '$$2 ~ /[tTwW]/ {printf $$1 $$3 "\\\\000"}'` ; \
                $(CC) $(CFLAGS) -DSYSTEM_MAP="\"$${smap}\"" \
                        -c common/system_map.c -o $(obj)common/system_map.o