pwm: pca9685: Drop explicit initialization of struct i2c_device_id::driver_data to 0

pwm: pca9685: Drop explicit initialization of struct i2c_device_id::driver_data to 0

The driver doesn'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.

While add it, also remove the trailing commas after the sentinel entry.

Link: https://lore.kernel.org/r/20240508130618.2148631-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>