USB connect problem in non blocking mode

[MubeenHCLite]

connected in non blocking mode (cinnect_blocking = false)

Summary of changes

Added HAL_PCD_Start() in init() so that the USB is detected in non blocking mode (connect_blocking = false)

Impact of changes

Fixes : #14763

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]

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

[0xc0170]

Wasn't there an issue opened or similar pull request related to connect issue? Or they are unrelated.

[Patater]

Wasn't there an issue opened or similar pull request related to connect issue? Or they are unrelated.

This one? #14763

[MubeenHCLite]

Wasn't there an issue opened or similar pull request related to connect issue? Or they are unrelated.

This one? #14763

The PR is for the same issue.

[ABOSTM]

@MubeenHCLite , you need to add
fixes #14763
at the end of your description so that issue will be closed automatically by github when this PR will be merged.

[ABOSTM]

LGM

[0xc0170]

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[mbed-ci]

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jenkins-ci/mbed-os-ci_build-example-ARM	✔️
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