i2c: implement detect callback

of_device_ensure_probed will call device::detect on the I2C adapter,
so it can detect its children node, in case they were not probed before.
This can happen if the nodes were added dynamically via device tree
fixup or overlay. Implement a detect callback to support this.

To keep existing behavior, we call this detect callback unconditionally
while newly registering the adapter.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230116133639.1999170-3-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

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