Front Haul Interface Library update to first seed code contribution

Front Haul Interface Library update to first seed code contribution

The following mandatory features of the ORAN FH interface are not yet
supported in this initial release:
1) RU Category:  Support of CAT-B RU (i.e. precoding in RU)
2) Beamforming: Beam Index Based and Real Time BF weights
3) Transport Features: QoS over FrontHaul
Additional Information available in the readme.txt file
xran root refers to the o-du/phy/fhi_lib folder

Issue-Id: ODUPHY-1

Change-Id: Ie2280e488524aefee29c8a2e6a0b47e963a40d3b
Signed-off-by: Luis Farias <luis.farias@intel.com>