drm/amdgpu: enable vcn/jpeg on vcn_v4_0_3

Enable vcn/jpeg on vcn_v4_0_3.

Signed-off-by: James Zhu <James.Zhu@amd.com>
Acked-by Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>