Merge branch 'feature-21-TM7' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-21-TM7

Conflicts:
	targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band38.tm1.exmimo2.conf

Something went wrong somewhere in the commit history, the function
was not correct.

The most obvious symptom was that way too much SR (scheduling requests)
were given to the UE whenever it had some PUCCH to send.

The case for TDD has not been tested.

Merge branch 'feature-21-TM7' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-21-TM7

Merge branch 'feature-21-TM7' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-21-TM7

Conflicts:
	openair1/PHY/INIT/lte_init.c

Merge branch 'feature-21-TM7' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-21-TM7

add ndi to trace ENB_MAC_UE_DL_SDU

The eNodeB may sometimes wrongly generate PHICH because somewhere
'phich_active' is not reset to 0, due to an unidentified reason. When
adding this hack the problem seems to disappear completely.

This is not the end of the story. The real underlying problem has to be
understood and fixed correctly.

The Msg3 ressource blocks used by random access procedure
were not correctly handled. The MAC scheduler could wrongly
allocate a ressource block for both random access Msg3 and
a regular UE.

This hotfix hopefully fixes the problem.

A new function "set_msg3_subframe" has been added in the
interface between PHY and MAC.

- Msg3 allocation
- initiation of Random Access procedure