drm/amdgpu: Do not program SQ_TIMEOUT_CONFIG in SRIOV

VF should not program this register.

Signed-off-by: Victor Lu <victorchengchi.lu@amd.com>
Reviewed-by: Zhigang Luo <Zhigang.Luo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>