FreeBSD/src 44a57bf (r353727)sys/dev/gpio gpioiic.c

gpioiic: add the detach method

bus_generic_detach was not enough, we also need to clean up the iicbus
child device.

MFC after:      1 week
DeltaFile
+10-1sys/dev/gpio/gpioiic.c
+10-11 files

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