semihosting: Fix typo in semihost_rename

[caspermeijn]

Summary of changes

Fix typo in semihost_rename. Now it actually sends the new_name as well as the old_name.

Impact of changes

Migration actions required

Documentation

None

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Pull request type

[X] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

This fix is includes in a downstream: Apache Mynewt

[] No Tests required for this change (E.g docs only update)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@caspermeijn, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[0xc0170]

we are having issues with github actions due to recent git update, they will fail here. Once we make it green again, we will get back here with an update

[0xc0170]

Github actions fix #15270 was merged, please rebase and it should be green

[0xc0170]

Please rebase to the latest master

Pull request has been modified.

[0xc0170]

CI started

[mbed-ci]

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