Cordio: fix for issue #12625

[vishalbharg]

Summary of changes

This fix is related to Mbed OS issue
#12625

This issue is related to WSF memory corruption when device send a complete HCI ACL packet to the transport. But fragmented packet case is not handled & WSF memory free is not happening, and later WSF memory (logic) corrupt which makes hard fault in OS.

Impact of changes

Migration actions required

Documentation

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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

[] No Tests required for this change (E.g docs only update)
[x] 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]

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

[adbridge]

@vishalbharg it looks like you changed the format of the PR template (removing header markers and section delimiters). Could you please not do this as it affects how our automated tools parse the content. PRs should look like this one #12662
Could you please restructure the PR header back to how it should be ? Thanks

[vishalbharg]

@adbridge done (according to #12662), Thanks

[0xc0170]

@ARMmbed/mbed-os-pan Please review

[0xc0170]

Started CI meanwhile

[mbed-ci]

Test run: SUCCESS

Summary: 7 of 7 test jobs passed
Build number : 1
Build artifacts

[0xc0170]

Waiting for the final reviews

[paul-szczepanek-arm]

This means the zero copy HCI will also need fixing nevermind, zero copy does not have fragmentation so it's OK but it should have assert to make sure there's no HCI limit