Baremetal tests: enable BLE tests with NUCLEO_WB55RG

[jeromecoutant]

Summary of changes

Goal is to enable feature_ble tests in baremetal mode for NUCLEO_WB55RG as this board supports BLE by default

Impact of changes

target	platform_name	test suite	test case	passed	failed	result	elapsed_time (sec)
NUCLEO_WB55RG-ARMC6	NUCLEO_WB55RG	connectivity-feature_ble-source-cordio-tests-cordio_hci-driver	Test cordio stack reset sequence	1	0	OK	0.1
NUCLEO_WB55RG-ARMC6	NUCLEO_WB55RG	connectivity-feature_ble-source-cordio-tests-cordio_hci-transport	Test multiple reset commands	1	0	OK	0.07

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]

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

[mbed-ci]

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