drm/radeon/kms: add new Trinity PCI ids

commit d430f7dbf7bd6aaaa40c0660b3204df8cf07b22b upstream.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>