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arm64: dts: Sort out CM5 and I/O board I2C ports
There is a difference in I2C usage between CM4IO and CM5IO. Present a simple, consistent view of the world by moving the assignment of the bus IDs into carrier-specific files.
Fixes: 36faab69e8ee ("dts: bcm2712-rpi: Add aliases for the CSI/DSI I2Cs") See: https://github.com/raspberrypi/linux/pull/6421