NUCLEO_WB55RG : enable IAR export

[jeromecoutant]

Summary of changes

This allows user to export a NUCLEO_WB55RG project in IAR IDE.

Impact of changes

Migration actions required

Documentation

---

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)

---

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

---

Reviewers

---

[ciarmcom]

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

[0xc0170]

CI started

[mbed-ci]

Test run: FAILED

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

Failed test jobs:

• jenkins-ci/mbed-os-ci_greentea-test

[0xc0170]

test restarted

[0xc0170]

Not related, will restart later

[mbed-ci]

Test run: FAILED

Summary: 1 of 6 test jobs failed
Build number : 2
Build artifacts

Failed test jobs:

• jenkins-ci/mbed-os-ci_greentea-test

[0xc0170]

CI restarted

[mbed-ci]

Test run: FAILED

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

Failed test jobs:

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

[0xc0170]

CI restarted

[mbed-ci]

Test run: SUCCESS

Summary: 6 of 6 test jobs passed
Build number : 4
Build artifacts