gpu: nvgpu: do not idle timed out channels

gpu: nvgpu: do not idle timed out channels

While suspending the device, do not submit WFI on
timed out channels

Submitting WFI on timed out channels will cuase submit_wfi()
to return error and as result of this, rail gating of device
will be prevented

Bug 200010416

Change-Id: Ic097bfdae59dbf9e1f2aea5d8d0431b5f1c3721b
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
(cherry picked from commit 9ac601c0035240f6bacc3c42c5cc9e7b85a65456)
Reviewed-on: http://git-master/r/426079
Reviewed-by: Todd Poynter <tpoynter@nvidia.com>
Tested-by: Todd Poynter <tpoynter@nvidia.com>