ARM: dts: am437x-idk: fix sleep pinctrl state

we have i2c0 sleep pinctrl state but were passing
default state anyhow. Fix that.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-idk-evm.dts

@@ -240,7 +240,7 @@ &i2c0 {
 	status = "okay";
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&i2c0_pins_default>;
-	pinctrl-1 = <&i2c0_pins_default>;
+	pinctrl-1 = <&i2c0_pins_sleep>;
 	clock-frequency = <400000>;
 
 	at24@50 {