JVET-AC0154: NNPF SEI IuC item 13, 31, and 34

Chaoyi Linrequested to merge
(removed):NNPFC_purpose into master
  1. IuC item 13: Add a constraint for frame rate purpose
  2. IuC item 31: Add new nnpfc purpose
  3. IuC item 34: Adjust the value range of nnpfc_num_kmac_operations_idc and nnpfc_total_kilobyte_size
Edited by Chaoyi Lin

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