Analogout free implementation for F4/F7/H7 boards

[AnishKumarHCL]

Summary of changes

Implemented analogout_free for F4/F7/H7 boards.

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

@jeromecoutant

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[ciarmcom]

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

[jeromecoutant]

@0xc0170 seems there is some travis issues ?

[0xc0170]

It is, @AnishKumarHCL Can you just rebase on the recent master, 3.5 tools test should be gone from Travis

[AnishKumarHCL]

done @0xc0170

[0xc0170]

CI started

[mbed-ci]

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jenkins-ci/mbed-os-ci_build-greentea-ARM	✔️
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jenkins-ci/mbed-os-ci_build-example-ARM	✔️
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jenkins-ci/mbed-os-ci_cmake-example-ARM	✔️
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jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
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