Greentea kvstorage tests Cypress targets fix.

[tymoteuszblochmobica]

Greentea kvstorage tests fixed to pass CY8CPROTO_062_4343W.

Summary of changes

Root of trust refactor caused side effect for CY8CPROTO_062_4343W.
CI didn't run on this target so issue wasn't disclosed.
This PR fixes it.

Impact of changes

No impact. this should fix Cypress target.

Migration actions required

Not needed

Documentation

Already merged
tymoteuszblochmobica/mbed-os-5-docs@ab7f37b

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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

@SeppoTakalo
@VeijoPesonen

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[ciarmcom]

@tymoteuszblochmobica, thank you for your changes.
@VeijoPesonen @SeppoTakalo @ARMmbed/mbed-os-storage @ARMmbed/mbed-os-maintainers please review.

[kyle-cypress]

Thanks for the fix. Confirmed with CY8CPROTO_063_BLE, CY8CKIT_062_WIFI_BT, and CY8CPROTO_062_4343W.

[mbed-ci]

Test run: SUCCESS

Summary: 5 of 5 test jobs passed
Build number : 1
Build artifacts

[mergify]

This PR does not contain release version label after merging.