drm: zap mmaps for dead devicesdrmrevoke

Once a DRM device is unregistered, user-space must not access any existing
mmaps, anymore. As we cannot rely on this, we now zap all of them in
drm_dev_unregister().

Any driver which wants to support that needs to protect their fault()
and mmap() handlers via drm_dev_get_active(), otherwise users can create
new mmaps after/during drm_dev_unregister().

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>

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