drm/amdgpu/gfx10: fix kiq locking in KCQ reset

[ Upstream commit a4b2ba8f ]

The ring test needs to be inside the lock.

Fixes: 097af47d ("drm/amdgpu/gfx10: 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>
Signed-off-by: Sasha Levin <sashal@kernel.org>