sb/intel/fsp_i89xx: Get rid of device_t

Use of device_t is discouraged unless necessary.

Change-Id: I89f9fe94c1e3e5c2b183572d7f603d016d0f0e1c
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26249
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
11 files changed