LTE RRC: upgrade dissector to v11.8.0

Change-Id: I2bb0861029d0d30ae372b0b8085fbedeb4932217
Reviewed-on: https://code.wireshark.org/review/2949
Tested-by: Pascal Quantin <pascal.quantin@gmail.com>
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>