drm/msm/submit: Simplify out-fence-fd handling

No need for this to be split in two parts.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20210728010632.2633470-6-robdclark@gmail.com


Signed-off-by: Rob Clark <robdclark@chromium.org>