changed threading (acqusition is slot based). removal of eNB_thread. timing all based on received timestamp.

Merge branch 'enhancement-10-harmony' of https://gitlab.eurecom.fr/oai/openairinterface5g into enhancement-10-harmony

Conflicts:
	openair1/PHY/LTE_TRANSPORT/dlsch_modulation.c
	openair1/SCHED/phy_procedures_lte_eNb.c

removed minor AVX2 optimizations from 16-bit turbo decoder. had issues for small block lengths in UE.

added lte-enb.c which extracts all enb-specific code from lte-softmodem. corrects merge from develop branch in dlsch_modulations.c. removal of HW-specific code in lte-softmodem.c

Conflicts:
	openair1/PHY/LTE_ESTIMATION/lte_dl_mbsfn_channel_estimation.c
	openair1/PHY/TOOLS/lte_dfts.c
	openair1/SIMULATION/LTE_PHY/dlsim.c

added fixes to build on odroid/xu4 platform

changes on bugfix-48-L1L2Signaling to build for odroid platform

the branch has been tested to build on x86 platform
- builds for eNB
- can do attach
- can ping external servers

On odroid,
- builds correctly
- eNB fails to come up due to late samples (same as parent branch)


See merge request !31