drivers: espi: UART to SoC mapping shall use device tree

[albertofloyd]

Currently using KConfig for eSPI virtual UART port to physical SoC UART

Need to use existing device tree selected uart in board device tree

[zephyrbot]

Hi @albertofloyd,

This issue, marked as an Enhancement, was opened a while ago and did not get any traction. Please confirm the issue is correctly assigned and re-assign it otherwise.

Please take a moment to review if the issue is still relevant to the project. If it is, please provide feedback and direction on how to move forward. If it is not, has already been addressed, is a duplicate, or is no longer relevant, please close it with a short comment explaining the reason.

Thanks!