drm/amdgpu: add mmhub v3_0 ip block

Add support for mmhub v3.0

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