cordio nrf: Add timer shutdown after time stop on deinit

[BramdeBoer1]

Summary of changes

This is a fix for issue #12127
This pull requests decreases the power consumption by 20uA after ble shutdown on the nrf52840 when using the cordio stack.

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

[] 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]

@BramdeBoer1, thank you for your changes.
@ARMmbed/mbed-os-pan @ARMmbed/mbed-os-maintainers please review.

[adbridge]

@BramdeBoer1 you seem to have deleted part of the PR template. Could you please restore it as in the future the sections will be automatically parsed. Also could you please complete the testing section? Thanks.

[adbridge]

Looks ok to me

[adbridge]

@pan- could you take a quick look please ?

[BramdeBoer1]

Restored the missing PR template parts.
I am however not quite sure about the testing part as i couldn't find an existing test for the nrf52840 cordio stack

[adbridge]

Restored the missing PR template parts.
I am however not quite sure about the testing part as i couldn't find an existing test for the nrf52840 cordio stack

@BramdeBoer1 thanks. We will probably have to wait for the PAN team to comment then. Though most people are now on Xmas break.

[adbridge]

@ARMmbed/mbed-os-pan could you please review

[0xc0170]

cc @desmond-blue

[0xc0170]

Travis had a problem to report a status,I 'll reopen this PR. It should help

[0xc0170]

@BramdeBoer1 Travis is having an issue to pick up this PR. I could not find it there in the history.

The quickest could be - just amend the last commit to only change sha - no changes and push force. It fixes it often.

[BramdeBoer1]

@0xc0170 done

[0xc0170]

Thanks @BramdeBoer1 . Travis is playing with us, it could not pick this up :/ Can you send a new PR completely. I don't think there is any other way. It happened previously and we just recreated a PR. Sorry for the inconvenience.