add heltec-v4-r8 board (#10268)

* add heltec-v4-r8 board

* Fixed default SPI pin and macro definition errors.

* update platformio.ini according device-ui LGFX display definitions

Co-authored-by: Copilot <copilot@github.com>

* fix commit reference

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Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: mverch67 <manuel.verch@gmx.de>
Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: Manuel <71137295+mverch67@users.noreply.github.com>
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