Remove mbed interface deprecated API

[rajkan01]

Summary of changes

Removed mbed interface deprecated API.

Impact of changes

Breaking change: mbed_error_vfprintf API has been deprecated since Mbed OS 5.11 and it is removed now.

Migration actions required

Use mbed_error_vprintf().

Documentation

None

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Pull request type

[] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[x] 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

@evedon

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[mbed-ci]

Test run: SUCCESS

Summary: 7 of 7 test jobs passed
Build number : 1
Build artifacts