mb/lenovo: Get rid of device_t

Use of device_t has been abandoned in ramstage.

Change-Id: Ic044fc074c43db683fcd85ce92a36a8c5a464a67
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26101
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
20 files changed