i2c: designware: Consider SCL GPIO optional

GPIO library can return -ENOSYS for the failed request.
Instead of failing ->probe() in this case override error code to 0.

Fixes: ca382f5b ("i2c: designware: add i2c gpio recovery option")
Reported-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-designware-master.c

@@ -644,7 +644,7 @@ static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev)
 	gpio = devm_gpiod_get(dev->dev, "scl", GPIOD_OUT_HIGH);
 	if (IS_ERR(gpio)) {
 		r = PTR_ERR(gpio);
-		if (r == -ENOENT)
+		if (r == -ENOENT || r == -ENOSYS)
 			return 0;
 		return r;
 	}