Remove extra kern_kldload from VBoxNetFlt-freebsd.c

[madpilot]

Summary

As reported in bug 256505 since base commit e266a0f7f001 performing kern_kldload while loading a kernel module is not allowed.

The VBoxNetFlt module does this to load ng_ether. Historically ng_ether was missing MODULE_VERSION information and could not be properly depended upon.

This has been fixed in base r238844 more than ten years ago though, so we can unconditionally use a proper MODULE_DEPEND.

Test Plan

Compiles fine in poudriere with all supported releases, and works as expected on head.

[madpilot]

Forgot to mention, I renamed the patch file to the new naming convention.

[madpilot]

I also plan to merge this to quarterly once committed, I'm waiting for some feedback on the bug report to make sure it works fine.