d3d12: Video Encode H264/HEVC - Store L0/L1 active nums at time to encode them in the headers
What does this MR do and why?
Fixes a bug introduced in !30908 (merged) where the PPS generated in the bitstream will mismatch what the frontend sends for num_ref_idx_l0_active_minus1
and num_ref_idx_l1_active_minus1
.
cc @jenatali