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>