The function generateDRB() sets the value to 100ms but the function
rrc_gNB_process_NGAP_PDUSESSION_SETUP_REQ() sets it to 0ms.

So what happens is that the UE gets the value 100ms in the
RRC Reconfiguration but the gNB creates the PDCP entity with 0ms.
Let's create it with 100ms instead, to be aligned with how we configure
the UE.

And also avoid some PDCP warnings at runtime when some packets
are retransmitted but rejected because of the 0ms timer. This is
the warning:

    [PDCP]   discard NR PDU rcvd_count=68469, entity->rx_deliv 68481,sdu_in_list 0

This is just a hotfix. A real solution is to have the RB creation in
only one place. And we should also have those parameters configurable.
Work for later.