- bugfix in nr_ue_dci_configuration
- cleanup of irrelevant RA-related data structure members in UE
- moved msg1 init condition to MAC
- minor fixes concerning init_ra function

- new data struct is RA_config_t
- all RA-related members have been moved to the new struct
- static variables have been migrated too

- as defined by clause 12 "BWP Operation" TS 38.213
- cleaned up hardcoded usage

- fetching configuration from RRC
- removed hardcoded params (e.g. bwp_id)
- added BWP Id members to MAC instance
- introduced offsetToCarrier

- enabled procedures that were already called for phy-test mode
- enabled setup of DRB for the current C-RNTI
- enhanced information, debugging and warning logging at MAC/RLC/PDCP level

Creation of fill_default_coresetZero() and fill_default_searchSpaceZero(). Resource allocation and transmission of the DCI of SIB1. Partial implementation of the reception of the DCI of SIB1.

This commit contains work done by Eurecom and by Benetel.

Created two dci_pdu's to hold dci configuration for UL and DL DCI.
This wasn't a problem before as only one DCI was scheduled.

- calling nr_ue_scheduled_response after pdu preparation
- increasing the number_pdus before response scheduling
- resetting after dl/ul config pdu handling

- moved RRC structs checks and mac configuration to config_ue.c
- new implementation of DCI configuration according to 3GPP TS 38.331
  version 15.9.0 Release 15 and 3GPP TS 38.213 version 15.9.0 Release 15

- Msg2 scheduler used for testing purposes was removed
- Now the UE tries to DCI 1_0 scrambled with RA_RNTI in the RA window
- If no RAPID is found within the RA window, instructs PHY to TX PRACH