STM32WB: enable QSPI for custom boards

[jeromecoutant]

Summary of changes

QSPI is supported by STM32WB MCU,
but was not implemented yet in mbed-os as there is no STM32WB target with embedded QSPI.

Support is now available for custom boards.

mbed_app.json example:

{
  "target_overrides": {
    "CUSTOM_BOARD": {
      "target.device_has_add": ["QSPI"],
      "target.components_add" : ["QSPIF"],
      "drivers.qspi_io0": "PX_x",
...
      "drivers.qspi_csn": "PX_x"
    }
  }
}

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

---

[ciarmcom]

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

[0xc0170]

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[mbed-ci]

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