ARM: dts: qcom: add alt_sleep_clk pinctrl configuration for Sun

Specify a pinctrl configuration for PMK8550 GPIO 3 to enable
alt_sleep_clk output so that clients like WLAN and BT can
function properly.

Change-Id: I74506946647b55e391a8c848c44ccf20af966739
Signed-off-by: Subbaraman Narayanamurthy <quic_subbaram@quicinc.com>

qcom/sun-pmic-overlay.dtsi

@@ -49,3 +49,19 @@
 		};
 	};
 };
+
+&pmk8550_gpios {
+	pinctrl-0 = <&alt_sleep_clk_default>;
+	pinctrl-names = "default";
+
+	alt_sleep_clk {
+		alt_sleep_clk_default: alt_sleep_clk_default {
+			pins = "gpio3";
+			function = "func1";
+			input-disable;
+			output-enable;
+			bias-disable;
+			power-source = <0>;
+		};
+	};
+};