Replace the use of the old device_t definition inside
southbridge/amd/rs780.
Change-Id: Ia9929baeec7423e9e2f06324038ddfbec006beb7
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/16477
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>