Add support for new unphone boards

[garethhcoleman]

First time doing this - please advise if any changes or clarification needed thanks!

Description of Change

Please describe your proposed Pull Request and it's impact.
Adds two new boards, the unPhone spin 8 and spin 9 to boards.txt and variants/unphone8 and variants/unphone9

Tests scenarios

Please describe on what Hardware and Software combinations you have tested this Pull Request and how.
Tested on our prototype hardware with a variety of test sketches, pin assignments seem correct.

Related links

Hardware description at unphone.net and software at https://gitlab.com/hamishcunningham/unphone

[CLAassistant]

All committers have signed the CLA.

[SuGlider]

@garethhcoleman - Please sign the CLA in order to move formward

[garethhcoleman]

@SuGlider thanks for prompt - I didn't realise that!

I will ask my collaborator to also sign.

Thanks again!

[SuGlider]

@hamishcunningham - Please sign the CLA in order to move forward

[SuGlider]

@garethhcoleman @hamishcunningham

It seems that there are some conflicts when merging boards.txt file because other vendors have already made their changes and those are already merged into the master branch. I think you may need to "rebase" your local repository and pull latest master branch from ESP32 in order to get the last version of boards.txt and just add your board entries at the end.

When done commit the changes and we will merge it to main master branch.