Move DU tree management from rrc_gNB_du.c into rrc_cell_management so that
DU and cell lookup logic live in one place, improving maintainability and
testability (there is no DU lib).
- rrc_cell_management: add du_compare(), RB_GENERATE(rrc_du_tree),
get_du_by_assoc_id(), rrc_add_du(), rrc_rm_du(), rrc_cleanup_du(),
rrc_free_du_container(); declare them in rrc_cell_management.h.
- rrc_gNB_du: move du_compare(), RB_GENERATE, get_du_by_assoc_id()
to rrc_cell_management
Guido Casati
6d0c7945c2