modifyreg[8|32]: use small lock in modifyreg[8|32]

[hujun260]

Summary

modifyreg[8|32]: use small lock in modifyreg[8|32]
reason:
We would like to replace the big lock with a small lock.

Impact

modifyreg

Testing

ci

[nuttxpr]

[Experimental Bot, please feedback here]

No, this PR does not fully meet the NuttX requirements. The summary is insufficiently detailed. It doesn't explain what modifyreg is, how the lock change works (e.g., what type of small lock is used), or why a smaller lock is beneficial (e.g., performance improvement). It also lacks links to any related issues.

The impact section is also incomplete. It only mentions modifyreg but doesn't properly address any of the required impact categories (user, build, hardware, documentation, security, compatibility). Simply stating "NO" or "YES" is not enough; a description is required for each "YES."

Finally, the testing section is inadequate. It provides no details on the build host or target environment, and the "testing logs" are empty. Actual logs demonstrating the change's behavior (before and after) are necessary.