Nuvoton: Bug fix of Nuvoton HUSBD driver's endpoint write

[cyliangtw]

This PR is to fix the bug of Nuvoton high speed usb driver USBPhyHw::endpoint_write() on writing zero packet use case.

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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[0xc0170]

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[0xc0170]

Looks like build failed with related issues to the changes.

Pull request has been modified.

[cyliangtw]

Fixed greentea test failure on NUMAKER_PFM_NUC472.

[0xc0170]

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