Remove leftover AMD CIMX RD890 northbridge support

Change-Id: I3f2cea79a11a52e94f479b25f22eb3726af38fa3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/26507
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
10 files changed