watchdog: ziirave_wdt: 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.

Signed-off-by: Uwe Kleine-König <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/ziirave_wdt.c

···
 }
 
 static const struct i2c_device_id ziirave_wdt_id[] = {
-	{ "rave-wdt", 0 },
+	{ "rave-wdt" },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id);