Musca-B1: Fix I2C pinmap array

[GaborAbonyi]

Summary of changes

Add closing element of the PinMap for I2C.

Impact of changes

Migration actions required

Documentation

N/A

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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]

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

[mergify]

This PR cannot be merged due to conflicts. Please rebase to resolve them.

[0xc0170]

@GaborAbonyi There was an update, please rebase and we start testing

Pull request has been modified.

[GaborAbonyi]

@0xc0170 Thanks! I wasn't sure if you take PRs while this PSA/TF-M transition is ongoing.

[0xc0170]

CI started

[mbed-ci]

Test run: SUCCESS

Summary: 6 of 6 test jobs passed
Build number : 1
Build artifacts

[0xc0170]

Will be merged as soon as we have 6.0.0 beta1 released