nb/amd/pi: Get rid of device_t

Change-Id: I9b1c597f5c6995f19e9697e8aa698fa672a220b1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/26473
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
3 files changed