amd/stoneyridge: Clean up include files in northbridge.h

Add an extra include file to northbridge.c for completeness.  cpu/msr.h
is already included in cpu/amd/mtrr.h which allows the file to build
properly.

Remove include files that are no longer required for the file.

Change-Id: I3e5ab39fd0640d2983fc5b7b202fb65d42c5ce3d
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/21615
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

0 files changed, 0 insertions, 0 deletions