Feature #5502: MS-side LLC implementation
LLC GIA/GEA (auth/encryption) not yet tested
Ms-side gprs ("modem" app) still has the LLC auth/encryption algos untested (not known to work yet).
The code in libosmo-gprs-llc ported from osmo-pcu is there, but passing/filling the proper params in related primitives.
Also, some code in libosmo-gprs-llc needs to be updated/fixed.