build fails: drm/bridge: make bridge registration independent of drm flow

Hi Ajay,

While doing build testing of linux-next I got a build failure.

I found that you'd removed a function in your commit (see subject) but callers still exist:

$ git grep drm_bridge_cleanup
drivers/gpu/drm/bridge/dw_hdmi.c:       drm_bridge_cleanup(bridge);
drivers/gpu/drm/sti/sti_dvo.c:  drm_bridge_cleanup(bridge);
drivers/gpu/drm/sti/sti_dvo.c:  drm_bridge_cleanup(bridge);
$

You probably want to fix up those remaining files and resubmit.

Thanks,
Paul.