drm/amdgpu: fix suspend/resume hang regression

Regression has been reported that suspend/resume may hang with
the previous vm ready check commit:
drm/amd#1922



So bring back the evicted list check as a temp fix.

Cc: <stable@vger.kernel.org>
Fixes: cc8dd2cc ("drm/amdgpu: check vm ready by amdgpu_vm->evicting flag")
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Qiang Yu <qiang.yu@amd.com>