Dirty.

- CDM groups used, multiple DMRS locations tested
- REMOVED compiler define NR_SC_FDMA
- enabled -Z option in ulsim for testing NR SC-FDMA
- Gnb UL Processing of LLRS even if last symbol allocated has no data
- transform precoding Enumerations used

- Removed tx_gain calculations and multiplication with tx signal
- Updated sigma value calculations and removed unused variables
- Re-indent the related code for better readability

- Added PTRS Symbols in a slot and Resource elements count in debug print

- As new sin cos table is used in phase noise function it shall be
  initialized for ULSIM also

This commit contains work done by Eurecom and by Benetel.

-To avoid including the whole x2 libraries for the corresponding executables

Maybe not the right way to do.
To be checked.

- Changed malloc to calloc to set all values to zero to remove the
  valgrind issue with uninitialized structure values in RC.gNB structure