boards/avr/avrdx/breadxavr: Adds TC74 Thermal Sensor to the board config.

[cederom]

Summary

PR delivered by kerogit over mailing list.

TC74 Tiny Serial Digital Thermal Sensor from Microchip is added to AVR Dx BreadBoard + board Documentation update.

Depends-on: #17403, #17404, #17404, #17405

Impact

boards/avr/avrdx/breadxavr: Added support for TC74 thermal sensor.

Testing

The driver was tested on AVR128DA28 chip using simple application that read the temperature from it and also switched it to/from standby state.

nsh> tc74_test
tc74_test [4:100]
nsh> Starting TC74 test
Temperature read: 23
Temperature read: 23

[cederom]

Documentation build fails because this PR depends on other PR that adds the temp sensor. It can be reconsidered when #17405 is merged.