Revert "nouveau: rip out busy fence waits"

This reverts commit d45bb9c5f7a6f7b6e47939856b28cb1da0cdc119.

Just got a report that this causes some suspend/resume issues,
so back it out and I'll investigate it later.

Reported-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
6 files changed