add #include "wsf_os.h" into hci_drv_apollo3.h

[idea--list]

Summary of changes

Fixes #14579
After adding #include "wsf_os.h" to hci_drv_apollo3.h i can place HciVsA3_SetRfPowerLevelEx(TX_POWER_LEVEL_PLUS_3P0_dBm); just before error = _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE); inside main.cpp.
No more unknown type errors after this fix.

It also seems to be effective as with HciVsA3_SetRfPowerLevelEx(TX_POWER_LEVEL_MINUS_10P0_dBm); both power consumption and also received signal strength is lower.

Impact of changes

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)
[] 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]

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

[0xc0170]

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