Update MTU for Foxconn to 9600

After capturing the FH packets, we observed that the RU supports the MTU value for jumbo frames.

Therefore, no fragmentation needed on DL.

Co-authored-by: Teodora Vladic <teodora.vladic@openairinterface.org>

doc/ORAN_FHI7.2_Tutorial.md

@@ -709,7 +709,7 @@ At this stage, RU must be rebooted so the changes apply.
 The OAI configuration file [`gnb.sa.band78.273prb.fhi72.4X4-foxconn.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4X4-foxconn.conf) corresponds to:
 - TDD pattern `DDDSU`, 2.5ms
 - Bandwidth 100MHz
-- MTU 8000
+- MTU 9600
 
 #### RU configuration
 

targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x4-foxconn.conf

@@ -257,7 +257,7 @@ fhi_72 = {
   io_core = 1;
   worker_cores = (2);
   ru_addr = ("6c:ad:ad:00:04:dc", "6c:ad:ad:00:04:dc");
-  mtu = 8000;
+  mtu = 9600;
   fh_config = ({
     T1a_cp_dl = (285, 470);
     T1a_cp_ul = (285, 429);