i2c: designware_i2c: Don't warn if reset DT property is not present

If reset property is missing in DT, then we get this warning:
	designware_i2c@0: Can't get reset: -2

Avoid this by checking if reset DT property is present, first.

Fixes: 622597dee4 ("i2c: designware: add reset ctrl to driver")
Signed-off-by: Maksim Kiselev <bigunclemax@gmail.com>
Reviewed-by: Heiko Schocher <hs@nabladev.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>

drivers/i2c/designware_i2c.c

@@ -764,7 +764,7 @@ int designware_i2c_of_to_plat(struct udevice *bus)
 
 	ret = reset_get_bulk(bus, &priv->resets);
 	if (ret) {
-		if (ret != -ENOTSUPP)
+		if (ret != -ENOTSUPP && ret != -ENOENT)
 			dev_warn(bus, "Can't get reset: %d\n", ret);
 	} else {
 		reset_deassert_bulk(&priv->resets);