Standard Pin Name: LED1 issue for targets without LED

[jeromecoutant]

Summary of changes

3 patches:

• generic_tests is now compatible with for targets without LED1
• events-timing test should not need any LED
• pin_names-generic test is now compatible with more targets

@MarceloSalazar

Impact of changes

MBED can support targets with or without LED and with or without BUTTON

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]

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

[0xc0170]

CI started

[mbed-ci]

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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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