- changed Mdlharq to Mlimit when comparing with the round number
- Not incrementing the HARQ round in case of err_flag = 1, until HARQ is implemented
- Changed MAX_LDPC_ITERATIONS to 5 from 4 (provided better performance)

- Setting the payload to random data instead of all zeros at the Tx side

- Handling "nb_symb_sch" equal to 0 in "phy_procedures_nrUE_RX" which prevents
  entering "nr_ue_pdsch_procedures"

- Handling symbol loop problem in "nr_ue_pdsch_procedures"

- Handling resource block loop problem in "nr_rx_pdsch"

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

This used to be done to ease power estimation in the UE,
but this is not correct. Let's put no energy in the REs
with no DCI data, which is what needs to be done.

Plus it consumes a lot of CPU because of calling taus()
way too much.

Some computation has been fixed in PUCCH reception.

SNR has been fixed, uses measurement instead of
a fixed value for the noise.

normalized_rx_power and target_rx_power have been removed,
replaced by snr and target_snr. All the files using those
variables have been updated.

Remove Coverity Scan CID 261519 (Using uninitialized value tmp. Field tmp.elems is uninitialized when calling _mm256_insert_epi16.)

Remove Coverity Scan CID 261470 (Using uninitialized value tmp. Field tmp.elems is uninitialized when calling _mm256_insert_epi8.)

however, I had to hardcode the parameters for the PUSCH in nr_ulsim as the fapi interface still has bugs.

Fix Coverity Scan CID 261470 (Using uninitialized value tmp. Field tmp.elems is uninitialized when calling _mm256_insert_epi8.)

Fix Coverity Scan CID 261519 (Using uninitialized value tmp. Field tmp.elems is uninitialized when calling _mm256_insert_epi16.)

Fix Coverity Scan CID 261649 (Variable rx_buffer going out of scope leaks the storage it points to.)

  -- cell synchronization was successful on the 1st try (in OAI UE + USRP) test

 - dci_request and dl_indication for PBCH now also on stack
 - fixed type of nrUE_config (was using structure for gNB before)
 - added configuration of PBCH to phy_config_request and using this config now in phy_procedures_nr_ue
 - we need to add configuration of PDCCH and PDSCH also to phy_config_request (there are still some hardcoded parameters)
 - removed UL scheduling for now