Configure PDCP entity for UE DRB with no integrity and ciphering to comply with configuration at gNB

-To be revisited if we want to enable integrity and ciphering for DRBs

dirty fixes that fix the UL malformed packets (detected in wireshark), and also internally memory corrpution

add DLinformationTransfer in nrUE, process SRB!=1 in UE (instead of discard), change struct member pdusession into pduSession to increase code readability (another struct contains also pdusession in lower case)

-RRCSetupComplete successfully transferred to RLC of the UE now through SRB1, but not at the MAC yet.
-Needed to enable some additional elements for RLC config. at the gNB side (asn1_msg.c) so that the addition of the SRB does not fail at the UE.
 To verify if these are really required.

removed reading reconfig.raw with --sa. Also a segfault upon reception of RRCSetup-CellGroupConfig when this is not in the RRC context.

added call to NAS for RRCSetupComplete message in UE. other minor modification in gNB/UE scheduling for SA

-For the moment SRBs are preconfigured (as was done for DRBs in noS1 mode)
but this should be removed

The code is forced to use nea2, no matter what the UE supports.

After 2^18 PDCP packets, it will fail to work (we don't use HFN yet).

These limitations will be fixed in later commits.

The existing security function was not reused, because it does too
much memory allocation and initializes the security context at each
ciphering. So here comes nr_pdcp_security_nea2_cipher(). And also
the ciphering is done inplace. To be changed if necessary.