Add ulsch decoding statistics measurements

Add ulsch decoding measurements, which are reported by nr_ulsim. Start ulsch_decoding_stats measurement before
nr_ulsch_decoding is called and stop it after collection of all decoder tasks from Tpool. In the context of nr_ulsim,
ULSCH_id is allways == 0, testing is performed per one TB, therefore measurement is started and stopped only once per trial.
Reported ulsch decoding statistics show the mean ulsch decoding time over x trials (specified by -n command line option of nr_ulsim).
This measurement does not provide valid information in case of nr-softmodem, when the loop is done over multiple ULSCH IDs -
start of the measurement is done multiple times and stops only once in this case.
For unitary physical simulators, ULSCH processing loop is executed only once
- the max number of PUSCH is set to 1. This ensures exactly one start and stop
of the ULSCH decoding time measurement per processed TB.

Note: ulsch decoding statistics reports average time of segmentation, rate matching, interleaving and decoding of the TB

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -924,6 +924,7 @@ int main(int argc, char *argv[])
     reset_meas(&gNB->rx_pusch_stats);
     reset_meas(&gNB->rx_pusch_init_stats);
     reset_meas(&gNB->rx_pusch_symbol_processing_stats);
+    reset_meas(&gNB->ulsch_decoding_stats);
     reset_meas(&gNB->ulsch_channel_estimation_stats);
     reset_meas(&UE->ulsch_ldpc_encoding_stats);
     reset_meas(&UE->ulsch_rate_matching_stats);
@@ -1548,6 +1549,7 @@ int main(int argc, char *argv[])
       printStatIndent2(&gNB->ulsch_channel_estimation_stats, "ULSCH channel estimation time");
       printStatIndent2(&gNB->rx_pusch_init_stats, "RX PUSCH Initialization time");
       printStatIndent2(&gNB->rx_pusch_symbol_processing_stats, "RX PUSCH Symbol Processing time");
+      printStatIndent(&gNB->ulsch_decoding_stats,"ULSCH total decoding time");
 
       printf("\nUE TX\n");
       printStatIndent(&UE->ulsch_encoding_stats,"ULSCH total encoding time");