nr pdcp: add --pdcp-drop option to drop packets in PDCP instead of RLC
This only works in monolithic. F1 split to be done later, it's a bit more complicated. And actually, the drop in RLC is still there, but it should not happen. Or much less. The logic around rlc_data_queue_occupancy() is not satisfying. It is done globally for all the UEs so we may underestimate the real free space in RLC for a given UE, and thus reject more packets than necessary.
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