Missing m_len in undefs for VxWorks

[budhe888]

F´ Version	4.1. 0
Affected Component

---

Problem Description

The fix in #4399 is missing

#undef m_len

So VxWorks builds can still fail with errors like this:

In file included from /home/asahasra/code/pfsoc-fsw-tester/build-fprime-automatic-vxworks/pfsoc-fsw-avionics/Ports/PfAvionicsDrv/GpDmaDbArraySerializableAc.hpp:14:
/home/asahasra/code/pfsoc-fsw-tester/build-fprime-automatic-vxworks/pfsoc-fsw-avionics/Ports/PfAvionicsDrv/GpDmaDataSerializableAc.hpp:242:11: error: expected ';' at end of declaration list
  242 |       U32 m_len;
      |           ^
/opt/engage/bsp/pfsoc-vxworks-bsp/vsb_bsp_mpfs/krnl/h/public/net/mbuf.h:158:23: note: expanded from macro 'm_len'
  158 | #define m_len           mBlkHdr.mLen

Context / Environment

Execute fprime-util version-check and share the output.

--INSERT HERE--

How to Reproduce

Expected Behavior

A description of the expected behavior.