nr pdcp: improvements

Implement data transfer (38.331 5.2): - transmit operation (in nr_pdcp_entity_recv_sdu) - receive operation (in nr_pdcp_entity_recv_pdu) - t-Reordering expiration

To keep track of time the function nr_pdcp_wakeup_timer_thread has been added and is called by the gNB's MAC scheduler via nr_pdcp_tick.

(The UE has not been modified.)

A thread has been introduced to set time of all the existing PDCP entities in the system. This probably does not scale well with many PDCP entities (many UEs connected to the gNB). To be changed at some point when needed. Hopefully, with a few UEs this mechanism won't be too problematic (ie. won't cause realtime problems).

The problem with time in PDCP is that SDUs are kept if some are missing, to do reordering. A timer is started and when it expires we have to transmit the SDUs even if some are still missing. We want to do that as soon as possible. So we have to check timers often (every millisecond).

In RLC the time is set when there is some activity (SDU or PDU received). In PDCP we cannot wait for this kind of activity. We would keep packets longer than necessary, which may disturb upper layers (think: TCP). That is why we introduced the thread, as a simple mechanism to keep packets no longer than necessary.

The locking done by this thread may create realtime issues.

The whole logic of time keeping can be changed later if it turns out that it is not efficient.

The functions dealing with DRB AM have been removed. All the types of PDCP entities (DRB AM, DRB UM, SRB) use the same mechanism for transmit and receive operations. So the code has been made common for all those types.

We don't deal with: - entity re-establishment, entity release or entity suspend - SDU discard (the timer is present but not used) - status reporting - data recovery - data volume calculation - header compression / decompression

There is no plan to implement those features in a near future.

Integrity protection is not done yet, and will be implemented soon.