drm/amdgpu: Populate VCN/JPEG harvest information

Certain instances of VCN/JPEG IPs may not be usable. Fetch the information
from harvest table.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>