Add Trace Funnel Coresight component

[rapgenic]

In this PR I implemented a simple graph node for coresight trace funnels.

The TraceFunnel component is quite simple, it reads the number of available channels and enables them all at initialization. The rationale of this choice is that I think that in most of the cases the user wants everything to be working since the beginning.

Channels can be enabled and disabled with the set_enable_channels function, which provides a warning if trying to set more channels than available.

This is show graph output with this patch:

pyocd> show graph
- "board": Board
  - "soc": Mimxrt1176dvmaa
    - "cm7": CortexM
      - DWT
      - FPB
      - ITM
      - TraceFunnel
    - "cm4": CortexM
      - DWT
      - FPB
      - ITM
      - TraceFunnel

[flit]

Mostly minor requests. The blank line on the end of funnel.py is the only required change.

Thanks for the patch!

[flit]

Sorry, I just realised… would you mind rebasing and retargeting this to the develop branch? Only fixes are allowed on main. After rebasing, you can edit this PR to modify the merge target branch.

[flit]

/azp run

[azure-pipelines]

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