gpu: host1x: Remove wait check support

The job submission userspace ABI doesn't support this and there are no
plans to implement it, so all of this code is dead and can be removed.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>