mb/elmex: Get rid of device_t

Use of device_t has been abandoned in ramstage.

Change-Id: If4ec2e2e7cca8d8f3e5abfd9cd204f86e367b44a
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26081
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
2 files changed