drm/amdgpu/smu13: drop compute workload workaround

commit 23170863 upstream.

This was fixed in PMFW before launch and is no longer
required.

Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>