drm/amdgpu/gfx9.4.3: fix kiq locking in KCQ reset

The ring test needs to be inside the lock.

Fixes: 4c953e53 ("drm/amdgpu/gfx_9.4.3: wait for reset done before remap")
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Jiadong Zhu <Jiadong.Zhu@amd.com>