drm/amdgpu/vcn5: Add VCN5 capabilities

Add VCN5 encode and decode capabilities support

Signed-off-by: David (Ming Qiang) Wu <David.Wu3@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>