i486/Toolchain.defs: move toolchain releated option to Toolchain.defs

[CV-Bowen]

Summary

Toolchain related options should be in Toolchain.defs

Impact

Only core refactor and minor changes, should be no impact

Testing

qmeu-i486:nsh

[nuttxpr]

[Experimental Bot, please feedback here]

Yes, this PR appears to meet the basic NuttX requirements in form, but lacks crucial details. While it follows the template, it provides insufficient information to properly assess the changes.

Here's why it's incomplete and what's missing:

• Summary: "Toolchain related options should be in Toolchain.defs" is a statement of intent, not a summary. What options were moved? Why were they moved? What problem did this solve? What files were modified?
• Impact: While it claims "no impact," this needs justification. Even refactoring can have unintended consequences. More thorough testing and explanation are needed. The claim of "minor changes" is vague.
• Testing: "qemu-i486:nsh" is insufficient. What tests were run? Simply stating the target platform and shell doesn't demonstrate functionality. Show specific commands and their output before and after the change. The "Testing logs" sections are empty. These need concrete examples demonstrating the change's effect (or lack thereof).

In short, the PR author needs to provide more specifics. They need to show, not just tell, what changed and how it was tested. While using the template is a good start, it's not enough without the supporting details.

[xiaoxiang781216]

@CV-Bowen please fix ci error.