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

[ Upstream commit 730ea507 ]

The ring test needs to be inside the lock.

Fixes: fdbd6948 ("drm/amdgpu/gfx9: 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>