Use dissect_e212_imsi() to dissect IMSI.
Fix deprecated APIs
Restore delted hf.

Change-Id: I5c08dd8e702a6fadd0409cec608d9a7b153f8164
Reviewed-on: https://code.wireshark.org/review/3746
Reviewed-by: Anders Broman <a.broman58@gmail.com>