SDP-K1: enable IAR compilation

[jeromecoutant]

Summary of changes

Issue with mbed-os-6.8.0:

[Error] PeripheralPins.c@435,25: [Pe029]: expected an expression
[Error] PeripheralPins.c@427,0: [Pe1345]: an empty initializer is invalid for an array with unspecified bound
[ERROR]
  };
  ^
"xxx\targets\TARGET_STM\TARGET_STM32F4\TARGET_STM32F469xI\TARGET_SDP_K1\PeripheralPins.c",435  Error[Pe029]: expected an expression

  MBED_WEAK const PinMap PinMap_USB_FS[] = {
                         ^
"xxx\targets\TARGET_STM\TARGET_STM32F4\TARGET_STM32F469xI\TARGET_SDP_K1\PeripheralPins.c",427  Error[Pe1345]: an empty initializer is invalid for an array with unspecified bound

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

[] 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

---

Reviewers

@kylejansen

---

[ciarmcom]

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

[kjansen-adi]

Looks good to me

[0xc0170]

I assume as there is no USB_FS, leaving this out would cause a compiler failure - rather than keeping it in with just NC fields.

[0xc0170]

CI started

[mbed-ci]

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jenkins-ci/mbed-os-ci_cmake-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-ARM	✔️
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jenkins-ci/mbed-os-ci_build-greentea-ARM	✔️
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jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
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jenkins-ci/mbed-os-ci_greentea-test	✔️
jenkins-ci/mbed-os-ci_cmake-example-test	✔️

[0xc0170]

I restarted travis.

[0xc0170]

I could not restart travis, reopening in a minute

[jeromecoutant]

@0xc0170 ping