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.
If the drop is done by PDCP, no drop will happen in RLC and it might happen that memory usage will grow in RLC, in which case there will be some warnings at runtime.
Edited by Cédric Roux