include autoconf.mk before any other .mk files

This bumps the autoconf.mk include step above board/cpu/arch/etc... so that
those .mk files can have make if statements based on the current config.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

config.mk

@@ -69,6 +69,9 @@ PLATFORM_CPPFLAGS+= -D__ARM__
 endif
 endif
 
+# Load generated board configuration
+sinclude $(OBJTREE)/include/autoconf.mk
+
 ifdef	ARCH
 sinclude $(TOPDIR)/$(ARCH)_config.mk	# include architecture dependend rules
 endif
@@ -87,9 +90,6 @@ ifdef	BOARD
 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk	# include board specific rules
 endif
 
-# Load generated board configuration
-sinclude $(OBJTREE)/include/autoconf.mk
-
 #########################################################################
 
 CONFIG_SHELL	:= $(shell if [ -x "$$BASH" ]; then echo $$BASH; \