cx231xx: Use muxed i2c adapters instead of custom switching

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This series changes cx231xx driver to use standard muxed i2c busses.
Everything works as before (tested with Hauppauge WinTV-930C-HD).
Also the scanning is changed to these new busses, but still does not work (as before).

Change scanning to read 1 byte instead of 0 only works for one bus.


V2: The constants are changed so muxed adapters are named I2C_1_MUX_1 and I2C_1_MUX_3.
With I2C_1 the underlying adapter could be reached (not recommended).

V3: Use snprintf for constructing i2c adapter names. Update comments for port_3 switch function.

Regards
Matthias

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