Fix UART initialization for NRF52

[marcuschangarm]

Description

Delayed initialization can cause problems when both UARTE instances
are in use. This change causes each UART object to initialize the
underlying UARTE instance immediately.

Pull request type

[X] Fix
[ ] Refactor
[ ] New target
[ ] Feature
[ ] Breaking change

[kegilbert]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 1882
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[marcuschangarm]

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[marcuschangarm]

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Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6771/1700

[marcuschangarm]

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Build : SUCCESS

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Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6771/

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[0xc0170]

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Test : FAILURE

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[0xc0170]

How does PR affects lp timeout? 😕 An issue on master with this test and the target?

[marcuschangarm]

How does PR affects lp timeout? 😕 An issue on master with this test and the target?

It doesn't. @studavekar and I suspects that something was merged the past week that introduces some instability on the NRF52. That's when the instability began.

[0xc0170]

It should be now green

/morph build

[mbed-ci]

Build : SUCCESS

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Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6771/

Triggering tests

/morph test
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Test : SUCCESS

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Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6771/1749