sb/amb/rs780: Get rid of device_t

By mistake this was forgotten from previous commit touching
the same directory.

Change-Id: I23e3e579ccbcb8a251cdde11215ec171b78b7159
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/26494
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed