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gpioiic(4), I2C bus over GPIO bit-banging

The gpioiic(4) driver allows to attach I2C busses using GPIO bit- 
banging.  Ported from OpenBSD.

Please note that a gpioiic(4) driver, once attached to gpio(4) device, can not be detached because the child device, the iic bus, can not bet detached (if possible I will change that).

The diff is also available online at

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