extcon: Drop explicit initialization of struct i2c_device_id::driver_data to 0

These drivers don't use the driver_data member of struct i2c_device_id,
so don't explicitly initialize this member.

This prepares putting driver_data in an anonymous union which requires
either no initialization or named designators. But it's also a nice
cleanup on its own.

Link: https://lore.kernel.org/lkml/20240918123150.1540161-6-u.kleine-koenig@baylibre.com/


Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>