Initial sync not happening fot FR2

2 issues at this point:
1.rfsim for FR1 works sometimes. other times 100 consec PBCH errors.(this commit)
2.PDCCH and PDSCH are not transmitted in correct slots. problem might be with sf_ahead.

fixed a bug in UE

gNB and UE runs without crashing; PBCH not decoding though

Conflicts:
	executables/nr-gnb.c
	openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

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

gNB runs fine. UE yet to be tested.

Develop Integration Branch : 2020 week 05

The following Merge Requests have been included :

* MR[702] : Add PUSCH-based TA updates (5G-NR)
* MR[764] : fix segv in drs_modulation.c (4G-LTE-UE)
* CI Python Framework improvement (X2 OpenAirCn Handover)
* Some Compilation warnings fixed

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

This reverts commit 615f365b.

- now the UE is passing again data to the upper layers in noS1 mode
- minor cleanups