nb/intel/fsp_sandybridge: Fix lost const qualifier on 'device_t'

Missing '*const' in Change #26195 added into function
northbridge_get_tseg_base(void).

Change-Id: Ideb9a9cb98d34f2ed1034b8ee20b3b06aa5ff1e2
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26455
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed