STM32 SPI: Update and improvement

[jeromecoutant]

Summary of changes

Few updates for STM32 SPI:

• STM32H7 is the first family using the new ST IP driver. Coming families will use the same IP.
  So many #if H7 are replaced by #if SPI_V2

• init procedure is updated following discussion in STM: Clear stale data from STM SPI peripheral before starting data transfer #14534

@LMESTM
@rvasquez6089 @vznncv

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

FPGA tests OK

[] 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.

[LMESTM]

the change includes a move of pullnone to pulldown that is not related to SPI V2 I think, better to split it

[0xc0170]

This is waiting for #14981 as it contains the same commits here now, I'll set as preceding PR required

[mergify]

This PR cannot be merged due to conflicts. Please rebase to resolve them.

[jeromecoutant]

This is waiting for #14981 as it contains the same commits here now, I'll set as preceding PR required

Rebase done

[LMESTM]

1 simple question check, if probably ok so approved :-)

[jeromecoutant]

Let's start CI ?

Pull request has been modified.

[0xc0170]

CI restarted

[mbed-ci]

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