LTE: Update MAC and RLC dissectors to Release 12

Change-Id: I036a0d1180b6481e8cc27210ed44eda4ba078a27
Reviewed-on: https://code.wireshark.org/review/5659
Reviewed-by: Martin Mathieson <martin.r.mathieson@googlemail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>