gprs: Add subscriber functions to create/handle GSUP messages

This patch extends gprs_subscr_query_auth_info and
gprs_subscr_location_update to create GSUP messages with the help of
a static gprs_subscr_tx_gsup_message function. A corresponding
gprs_subscr_rx_gsup_message is added which takes a messages, gets the
subscr, and updates it accordingly.

Sponsored-by: On-Waves ehf

[hfreyther: Added a msgb_free gprs_subscr_tx_gsup_message]
5 files changed
tree: 0de9ea5d89c2e0a36cb4acbecdca73f24649159c
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README