drm/bochs: Remove explicit drm_connector_register

drm/bochs: Remove explicit drm_connector_register

This is leftovers from the old drm_driver->load callback
upside-down issues. It doesn't do anything for not-hotplugged
connectors since drm_dev_register takes care of that.

Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: virtualization@lists.linux-foundation.org
Link: https://patchwork.freedesktop.org/patch/msgid/20200415074034.175360-60-daniel.vetter@ffwll.ch