arm64: dts: qcom: 8x16: UART1 add CTS_N, RTS_N pin configurations

Add devicetree bindings for UART1 CTS_N and RTS_N pins.
Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: Andy Gross <agross@codeaurora.org>

arch/arm64/boot/dts/qcom/msm8916-pins.dtsi

@@ -16,10 +16,13 @@ &msmgpio {
 	blsp1_uart1_default: blsp1_uart1_default {
 		pinmux {
 			function = "blsp_uart1";
-			pins = "gpio0", "gpio1";
+			//	TX, RX, CTS_N, RTS_N
+			pins = "gpio0", "gpio1",
+			       "gpio2", "gpio3";
 		};
 		pinconf {
-			pins = "gpio0", "gpio1";
+			pins = "gpio0", "gpio1",
+			       "gpio2", "gpio3";
 			drive-strength = <16>;
 			bias-disable;
 		};
@@ -28,10 +31,12 @@ pinconf {
 	blsp1_uart1_sleep: blsp1_uart1_sleep {
 		pinmux {
 			function = "gpio";
-			pins = "gpio0", "gpio1";
+			pins = "gpio0", "gpio1",
+			       "gpio2", "gpio3";
 		};
 		pinconf {
-			pins = "gpio0", "gpio1";
+			pins = "gpio0", "gpio1",
+			       "gpio2", "gpio3";
 			drive-strength = <2>;
 			bias-pull-down;
 		};