Add building, flashing, and debugging support for CY8CPROTO_062S3_4343W

[multiplemonomials]

Summary of changes

I picked up an Infineon PSoC 62 dev kit a while back, and finally got around to trying it with Mbed. Getting it working was a little bit of an adventure (as some new features had to be added to support multicore CPUs), but I have building, flashing, and debugging working now!

Made the following changes:

• Fixed the "external wifi firmware" resource code. This code was under Target_CYPRESS but wanted to use the block device code, which is a no-go in the new CMake build system (code in mbed core can't use BlockDevice). In fact, ARM never actually added this code to the CMake build system! I updated this code to be its own library and then linked it in to the correct places where it wants to provide the default block device.
• Added upload method config for MBED, PYOCD, and OPENOCD.
• Added support to PYOCD and OPENOCD for selecting the core index (as this is the first dual-core device we have seen where the core we want is not core 0)
• Added support to OPENOCD for customizing the reset sequence, as this chip needs a custom reset sequence
• Switched to using monitor program instead of load with OpenOCD, as the former works with this target while the latter does not.
• Fix loading hex files with OpenOCD not working, as OpenOCD would add the offset passed on the command line to the offset in the hex file, leading to your hex file being loaded at double the intended start address.
• Made MCU_PSOC62_CM4 and MCU_PSOC64_CM4 their own target families to better reflect how the devices are organized
• Removed OpenOCD_SCRIPT_DIR entirely. I added this a long time ago, before I realized that you could just pass OpenOCD scripts by relative path. This variable made it hard to switch the version of OpenOCD in use, because you had to set both OpenOCD and OpenOCD_SCRIPT_DIR on the command line, so removing it improves usability by a lot.
• Reworked mbed_adjust_upload_debug_commands(). This function, I found out, had a significant issue, which is that the way it used cache variables made it impossible to modify MBED_UPLOAD_LAUNCH_COMMANDS after the first time CMake was run! Looking at it, it seemed a lot simpler to make this function into a getter that doesn't modify the global variable, as it's only used in two places.

Note that I did not run the test suite yet as there still seem to be a few issues to fix there. But I will do that next.

Impact of changes

• PYOCD and OPENOCD upload methods now support debugging cores other than core 0
• OpenOCD should work a little bit better and be more configurable
• CY8CPROTO_062S3_4343W now compiles!
• We now support flashing and debugging Cypress PSoC 62 targets

Migration actions required

Documentation

Updated the doc site with the new upload method variables!

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Pull request type

[] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[X] 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)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[X] Tests / results supplied as part of this PR

I have verified that I can flash and debug using VS Code and the command line (sadly not CLion as it doesn't allow the same level of customization of the GDB init sequence...). Also verified that the wifi firmware does boot (though the wifi tests are still hardfaulting, need to investigate why in a subsequent PR).

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