[gprs] pass BSSGP UL-UNITDATA Cell ID up into GMM layer

BSSGP stores a pointer to the Cell Identifier IE in msgb->cb, which
is later used by the GMM layer to identify the cell that has sent a
given message.

This now also means that the gsm_04_08_gprs.c code is free of any
legacy references to msg->trx or struct gsm_bts.
2 files changed
tree: 41fee5e812f531cf581414f42ca0d118692f7a10
  1. openbsc/