drm/amdgpu: Stop clearing kiq position during fini

Do not clear kiq position in RLC_CP_SCHEDULER so that CP could perform
IDLE-SAVE after VF fini.
Otherwise it could cause GFX hang if another Win guest is rendering.

Signed-off-by: leiyaoyao <yaoyao.lei@amd.com>
Acked-by: ZhenGuo Yin <zhenguo.yin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>