drm/amdgpu:fix kiq_resume routine (V2)

v2:
use in_rest to fix compute ring test failure issue
which occured after FLR/gpu_reset.

we need backup a clean status of MQD which was created in drv load
stage, and use it in resume stage, otherwise KCQ and KIQ all may
faild in ring/ib test.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>