mainboard/tyan/s8226: transition away from device_t

Replace the use of the old device_t definition inside
mainboard/tyan/s8226.

Change-Id: I41729fc03518a7804ae224c773967453a7ab60a7
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/17309
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
2 files changed