Remove unavailable and EOLed target boards - Cypress/Infineon

[multiplemonomials]

Summary of changes

This PR removes various Cypress (now Infineon) target boards that the targets.json5 scrub identified as being EoL and/or no longer manufactured.

As a reminder, boards must be sold to the general public to qualify for inclusion in Mbed CE as a target board. If your board is not available to the general public, you are welcome to use Mbed on it, but please maintain it as a custom target outside of the Mbed CE source tree.

Impact of changes

The following target was removed:

• CYBSYSKIT_01

Migration actions required

If you use one of the removed targets, you will either need to migrate to a custom target, or propose to Mbed CE why this target should be re-added and the change from this PR reverted.

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

[X] No Tests required for this change (E.g docs only update) [] 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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