Added extra HSE Values for STM32G431xB

[cooleo2]

Summary of changes

The STM32G431xB driver is changed to accept the HSE values of 4, 8 and 16 MHz

The original driver for the STM32G431xB required the HSE value to be 24MHz. However, this value is only applicable to the Nucleo boards, and not applicable to any custom STM32G431xB based boards. For custom boards, there is often HSE oscillators of other values, notably 8MHz.

Impact of changes

Migration actions required

Documentation

None

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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[jeromecoutant]

In fact, when HSE_VALUE is not 24MHz, error message is not correct,
value is supported but configuration (PLLM and PLLN values) are not correct to get a 160MHz SysClock value

[jeromecoutant]

Looks OK, thx

[mbed-ci]

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