The VCN3 instances can do both decode as well as encode.

Share the scheduler load balancing score and remove fixing encode to
only the second instance.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-and-Tested-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>