PORTENTA_H7: CYW4343X support and BLE low power implementation

[pennam]

Summary of changes

1. COMPONENT_CYW4343X make transport layer generic.
2. BLE low power implementation for PORTENTA board.

Impact of changes

All boards using COMPONENT_CYW4343X

Migration actions required

Documentation

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Pull request type

[] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[X] 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)
[] 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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[pennam]

@facchinm @polldo i need some advice about 3a38556 and cca4043. They are not needed anymore?

[facchinm]

So, we need to retest on nano33ble, but cca4043 should be dropped (it's harmful in the latest versions of Cordio).
3a38556 is a bit more complicated since it is needed by some v3 boards (which are actively being sold). It's not needed for sure on v4, so I'd keep in out "extrapatches" when building the core but avoid filing it mainline.

[pennam]

On my v3 board 3a38556 is not needed but without 6378d88 BLE is not working.
For portenta boards i would keep this pr as is plus 3a38556 and 6378d88 as BLE "extrapatches"

[pennam]

@facchinm i was submitting the pr but then i tought that cypress would not be happy to lose cyhal support, so i've made some changes here pennam@2db301c. What do you think about it? I don't like it too much, but it will preserve cyhal support for cypress targets and the possibility to use uart for all the others.

[pennam]

Mainlined as ARMmbed#14227 and ARMmbed#14420

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