the whole UE_sched_ctrl is initialized in add_new_nr_ue(), which will
also init the per-UE HARQ.

- do DRB preconfiguration for deafult C-RNTI if !do_ra
- moved redundant configuration code at RLC layer to new RLC functions

- Giving C-RNTI as an input to DRB preconfiguration
- Set C-RNTI from UE configuration for higher layer function calls

The phytest preprocessor schedules only one UE, as many RBs as possible
(largest continuous RB region), with a fixed MCS and time domain
allocation.

This commit contains work done by Eurecom and by Benetel.

The name NR_UE_list_t is misleading: beyond being a simple "list", this
structure carries all/most UE-related MAC information. If at all, it is
a container for multiple lists. The next commit introduces a
NR_UE_list_t structure that organizes UEs in lists such that it is
easier to go through the UEs.

The name NR_UE_list_t is misleading: beyond being a simple "list", this
structure carries all/most UE-related MAC information. If at all, it is
a container for multiple lists. The next commit introduces a
NR_UE_list_t structure that organizes UEs in lists such that it is
easier to go through the UEs.

Also fixed bugs in ulsim and dlsim harq tests

-Remaining LTE dependency in RLC add_srb function (not used for NSA setup)
-Rename function for DRB static preconfiguration used in noS1 mode

- Updated PRACH procedures and general code formatting
- gNB msg1 handling and RAR generation
- general bug fixing
- formatting
- missing headers
- RAR handling.

Initial implementation.

nr_rlc/nr_rlc_oai_api.c will need some clean rewrite at some point.

More testing is also needed.

- Initial gNB DLSCH and UE spec scheduling implentation
- MAC PDU generation (including header as per TS 38.321)
- MAC PDU processing at UE side with extracion of TA updates
- General code cleanup
- Introduced NR MAC COMMON folder, moved common files here

This reverts commit e47cd4a0.