Merge remote-tracking branch 'origin/fhi-72-cleanup-doc' into integration_2025_w12 (!3285)

Update FHI 7.2 documentation, minor code cleanup

- remove some unused functions
- make one function static
- add callback function documentation
- provide some developer function

doc/ORAN_FHI7.2_Tutorial.md

@@ -1059,10 +1059,10 @@ section](.#build-oai-gnb)) to see if it resolves the problem.
 # Operation with multiple RUs
 
 It is possible to connect up to 4 RUs to one DU at the same time and operate
-them as a (single) distributed antenna (array). This works since all RUs and
-the DU are synchronized onto a common clock using PTP. The assumed
-configuration is that with N RUs each having an M×M configuration, we
-effectively reach an (N×M)×(N×M) configuration.
+them either with a single antenna array or a distributed antenna array.  This
+works since all RUs and the DU are synchronized onto a common clock using PTP.
+The assumed configuration is that with N RUs each having an M×M configuration,
+we effectively reach an (N×M)×(N×M) configuration.
 
 Some caveats:
 - Since it's a distributed antenna, this implies that this setup will deploy a

doc/README.md

@@ -117,6 +117,7 @@ Some directories under `radio` contain READMEs:
 - [USRP](../radio/USRP/README.md)
 - [BladeRF](../radio/BLADERF/README)
 - [IQPlayer](../radio/iqplayer/DOC/iqrecordplayer_usage.md), and [general documentation](./iqrecordplayer_usage.md)
+- [fhi_72](../radio/fhi_72/README.md)
 
 The other SDRs (AW2S, LimeSDR, ...) have no READMEs.