platform: disable FreeRTOS+TCP verbose logging on Zynq-A9

[zevorn]

Summary

Disable FreeRTOS+TCP verbose debug logging that floods the interactive shell output on Zynq-A9 QEMU.

Problem

Shell output was polluted with TCP/IP internals:

<You>  thinking ..   MSS change 1400 -> 1460
TCP: active 24024 => 163.25.18.104 port 443 set ESTAB
FreeRTOS_FindEndPointOnNetMask: No match for 681219a3ip
ARP 681219a3ip hit using a000202ip
GEM TX: len=276 buf=0x19bc52
...

Fix

• ipconfigHAS_PRINTF=0, ipconfigHAS_DEBUG_PRINTF=0 in FreeRTOSIPConfig.h
• Remove GEM TX debug printf from NetworkInterface.c
• Remove verbose [net] and [init] prints from main.c
• Keep [net] network up: x.x.x.x on DHCP success

After

rt-claw: Zynq-A9 QEMU (FreeRTOS) - Real-Time Claw
[I/init] init: gateway / sched / swarm / net / tools / ai_engine
[net] network up: 10.0.2.15

  rt-claw chat  (type /help for commands)

<You> _

Test plan

• make build-zynq-a9-qemu compiles
• make run-zynq-a9-qemu — clean shell output, no TCP/ARP spam