ARM: dts: lpc4357-ea4357: add pinctrl and uart0 muxing

Setup pin muxing and properties for the debug console on uart0.
Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/lpc4357-ea4357-devkit.dts

@@ -36,6 +36,26 @@ memory {
 	};
 };
 
+&pinctrl {
+	uart0_pins: uart0-pins {
+		uart0_rx_cfg {
+			pins = "pf_11";
+			function = "uart0";
+			input-schmitt-disable;
+			bias-disable;
+			input-enable;
+		};
+
+		uart0_tx_cfg {
+			pins = "pf_10";
+			function = "uart0";
+			bias-pull-down;
+		};
+	};
+};
+
 &uart0 {
 	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
 };