drm/nouveau: create userspace clients as subclients

This will allow the DRM to share memory objects between clients later
down the track.

For the moment, the only immediate benefit is less logic required to
handle suspend/resume.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2016-05-23 11:25:17 +10:00
commit 80e60973b2