Makefile: Make autoconf.mk a dependency of the depend target

The original code did not generate autoconf.mk until after some targets
dependencies had already been calculated, for example the directories in
the SUBDIRS variable

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

Makefile

@@ -348,31 +348,31 @@ $(obj)u-boot:		depend $(SUBDIRS) $(OBJS) $(LIBBOARD) $(LIBS) $(LDSCRIPT)
 			--start-group $(__LIBS) --end-group $(PLATFORM_LIBS) \
 			-Map u-boot.map -o u-boot
 
-$(OBJS):	depend $(obj)include/autoconf.mk
+$(OBJS):	depend
 		$(MAKE) -C cpu/$(CPU) $(if $(REMOTE_BUILD),$@,$(notdir $@))
 
-$(LIBS):	depend $(obj)include/autoconf.mk $(SUBDIRS)
+$(LIBS):	depend $(SUBDIRS)
 		$(MAKE) -C $(dir $(subst $(obj),,$@))
 
-$(LIBBOARD):	depend $(LIBS) $(obj)include/autoconf.mk
+$(LIBBOARD):	depend $(LIBS)
 		$(MAKE) -C $(dir $(subst $(obj),,$@))
 
-$(SUBDIRS):	depend $(obj)include/autoconf.mk
+$(SUBDIRS):	depend
 		$(MAKE) -C $@ all
 
-$(LDSCRIPT):	depend $(obj)include/autoconf.mk
+$(LDSCRIPT):	depend
 		$(MAKE) -C $(dir $@) $(notdir $@)
 
 $(NAND_SPL):	$(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk
 		$(MAKE) -C nand_spl/board/$(BOARDDIR) all
 
-$(U_BOOT_NAND):	$(NAND_SPL) $(obj)u-boot.bin $(obj)include/autoconf.mk
+$(U_BOOT_NAND):	$(NAND_SPL) $(obj)u-boot.bin
 		cat $(obj)nand_spl/u-boot-spl-16k.bin $(obj)u-boot.bin > $(obj)u-boot-nand.bin
 
 $(ONENAND_IPL):	$(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk
 		$(MAKE) -C onenand_ipl/board/$(BOARDDIR) all
 
-$(U_BOOT_ONENAND):	$(ONENAND_IPL) $(obj)u-boot.bin $(obj)include/autoconf.mk
+$(U_BOOT_ONENAND):	$(ONENAND_IPL) $(obj)u-boot.bin
 		cat $(obj)onenand_ipl/onenand-ipl-2k.bin $(obj)u-boot.bin > $(obj)u-boot-onenand.bin
 		cat $(obj)onenand_ipl/onenand-ipl-4k.bin $(obj)u-boot.bin > $(obj)u-boot-flexonenand.bin
 
@@ -394,7 +394,7 @@ updater:
 env:
 		$(MAKE) -C tools/env all MTD_VERSION=${MTD_VERSION} || exit 1
 
-depend dep:	$(TIMESTAMP_FILE) $(VERSION_FILE)
+depend dep:	$(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk
 		for dir in $(SUBDIRS) ; do $(MAKE) -C $$dir _depend ; done
 
 TAG_SUBDIRS += include