Autoboot is controlled by autoboot_timeout and autoboot_abort_key
variables which might be altered by init scripts, so we need to
register them before those scripts are run. Otherwise they are
set back to defaultenv values upon registration.

Fixes: 35266d7e583f ("startup: Factor out the autoboot counter...")
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>