FPGA_CI_TEST_SHIELD : force all peripheral to be tested

[jeromecoutant]

Summary of changes

Some FPGA tests are testing all peripherals,
some are testing only 1, in order to save time I suppose.

Proposition is to be able to force all peripherals tests.

Impact of changes

With default configuration, there is no impact.
Impact comes only if user manually set FPGA_FORCE_ALL_PORTS macro.

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-hal @ARMmbed/mbed-os-test @ARMmbed/mbed-os-maintainers please review.

[kjbracey]

CI started

[mbed-ci]

Test run: SUCCESS

Summary: 11 of 11 test jobs passed
Build number : 1
Build artifacts

[mprse]

Looks good.

One minor thing is that in the PWM test we could simply set timeout to 300 instead of setting timeout depending on FPGA_FORCE_ALL_PORTS symbol.

[mergify]

This PR does not contain release version label after merging.