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19730: boards/qn9080dk: fix periph conflict r=maribu a=maribu
### Contribution description
- Document which I2C/SPI/UART peripheral maps to which FLEXCONN IP block to easily detect potential overlap
- Switch conflict between SPI and I2C peripheral by using a different FLEXCONN for I2C
19731: boards/qn9080dk: update doc on flashing r=maribu a=maribu
### Contribution description
- update the doc on the internal programmer firmware:
- not only switching to J-Link, but also just updating it does improve reliability of flashing
- give hints in how to get the ~~shitty~~ wonderful update process working
- update notes on OpenOCD requirements
Co-authored-by: Marian Buschsieweke <marian.buschsieweke@posteo.net>