This uses the previous changes to add reference counts
to drm connector objects.

v2: move fbdev changes to their own patch.
add some kerneldoc
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NDaniel Stone <daniels@collabora.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>