drm/amdgpu: add missing clock gating info in amdgpu_pm_info

add missing clock gating informations in amdgpu_pm_info
1. AMD_CG_SUPPORT_VCN_MGCG
2. AMD_CG_SUPPORT_HDP_DS
3. AMD_CG_SUPPORT_HDP_SD
4. AMD_CG_SUPPORT_IH_CG
5. AMD_CG_SUPPORT_JPEG_MGCG

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>