Use dissect_e212_mcc_mnc_wmem_packet_str() to dissect PLMN(id).
Fix a few deprecated APIs

Change-Id: I8a535417234a6e739eeb0835e524d6e367150340
Reviewed-on: https://code.wireshark.org/review/3745
Reviewed-by: Anders Broman <a.broman58@gmail.com>