gpio: pca953x: Remove redundant forward declaration

There is no need to have a forward declaration for pca953x_dt_ids[].
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpio-pca953x.c

@@ -860,8 +860,6 @@ static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 	return ret;
 }
 
-static const struct of_device_id pca953x_dt_ids[];
-
 static int pca953x_probe(struct i2c_client *client,
 			 const struct i2c_device_id *i2c_id)
 {