Nuvoton: Fix hal_watchdog_kick() with WDT stopped

[ccli8]

Summary of changes

This PR tries to fix watchdog_kick() which shall do nothing when WDT is stopped according to WDT HAL spec.

Change targets:

• NUMAKER_PFM_NANO130
• NUMAKER_PFM_M453
• NUMAKER_PFM_NUC472
• NUMAKER_PFM_M487/NUMAKER_IOT_M487

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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)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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[ciarmcom]

@ccli8, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[ccli8]

Update?

[0xc0170]

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[mbed-ci]

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