drm/amdgpu: Update headers for CPER support on SRIOV

Update amdgv_sriovmsg.h and mxgpu_nv.h to add new definitions for
CPER support on VFs. PMFW ACA messages are not available on VFs,
and VFs must query CPERs from host.

Signed-off-by: Tony Yi <Tony.Yi@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>