include/generated/autoconf.h is included from include/linux/kconfig.h
and we already have "-include $(srctree)/include/linux/kconfig.h"
just below.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>