drm/amdgpu: support query ecc cap for SIENNA_CICHLID

driver needs to query umc_info_v3_3 for ecc capability
in sienna_cichlid

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>