First set of Ux500 DTS changes for the v5.6 kernel:

- Add the GPADC IIO channels
- Factor out generic pin configuration
- Add the gpio_in_nopull configuration
- Tighten up I2C and SPI buses
- Clean up some compatibles
- Extract a generic DB8500 DTSI
- Add HREF520 DTS and the associated DB8520 DTSI
- Split TVK R2 and R3 to separate DTSI files
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