STM32L1 : enable ADC after deepsleep

[jeromecoutant]

Summary of changes

See STM32L1 Reference Manual:
12.3.2 ADC clock
When entering Stop mode, the ADC analog and digital interfaces remain inactive as the HSI and PCLK2 are disabled. Since the HSI is still deactived after resuming from Stop mode, the user must enable the HSI as the ADC analog interface clock source and continue using ADC conversions.

Fix #14475

@chrissnow

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)
[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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[ciarmcom]

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

[chrissnow]

Works for me 👍
Thanks for the continued assistance.

[0xc0170]

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