Convert newlines on all terminal (tty) devices by default

[hugueskamba]

Summary of changes

Applications can reduce their ROM usage by replacing
"\r\n" by "\n".

Impact of changes

Breaks compatibility with applications built with Mbed 2.

Migration actions required

Update to the latest version of Mbed OS (possibly using the bare metal profile for ultra-constrained devices).

Documentation

N/A

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Pull request type

[] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[X] 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

[X] 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

@evedon @kjbracey-arm

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[ciarmcom]

@hugueskamba, thank you for your changes.
@evedon @kjbracey-arm @ARMmbed/mbed-os-core @ARMmbed/mbed-os-maintainers please review.

[0xc0170]

Based on the change and description, this should be Major update. Marked as breaking

[kjbracey]

Fine apart from description - it's not "all file descriptors". It won't be doing it to a disc file, just terminal devices (whose FileHandle::isatty returns true).

[evedon]

@hugueskamba please address Kevin's comment. Otherwise PR is fine.

[0xc0170]

CI started

Pull request has been modified.

[0xc0170]

CI aborted, and restarted

[hugueskamba]

This force-push amends the commit message.

[mbed-ci]

Test run: FAILED

Summary: 2 of 3 test jobs failed
Build number : 1
Build artifacts

Failed test jobs:

• jenkins-ci/mbed-os-ci_build-GCC_ARM
• jenkins-ci/mbed-os-ci_build-ARM

[0xc0170]

The above is from aborted built, the new one is going fine.

[mbed-ci]

Test run: SUCCESS

Summary: 6 of 6 test jobs passed
Build number : 2
Build artifacts