i2c: mxc: Make 'no gpio pinctrl state' print as debug

Some I2C bus devicetree nodes, doesn't require to have
gpio pinctrl so replace the dev_info to debug so the
print never comes on the console and for bus that uses
gpio pinctrl anyway have dev_err.

Before:
------
U-Boot> i2c dev 1
Setting bus to 1
i2c bus 1 at 0x21a4000, no gpio pinctrl state.

After:
------
U-Boot> i2c dev 1
Setting bus to 1

Cc: Simon Glass <sjg@chromium.org>
Cc: Heiko Schocher <hs@denx.de>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Heiko Schocher <hs@denx.de>

drivers/i2c/mxc_i2c.c

@@ -775,7 +775,7 @@ static int mxc_i2c_probe(struct udevice *bus)
 	 */
 	ret = fdt_stringlist_search(fdt, node, "pinctrl-names", "gpio");
 	if (ret < 0) {
-		dev_info(dev, "i2c bus %d at 0x%2lx, no gpio pinctrl state.\n", bus->seq, i2c_bus->base);
+		debug("i2c bus %d at 0x%2lx, no gpio pinctrl state.\n", bus->seq, i2c_bus->base);
 	} else {
 		ret = gpio_request_by_name_nodev(fdt, node, "scl-gpios",
 						 0, &i2c_bus->scl_gpio,