arm64: dts: apq8096-db820c: Enable on board 3 pcie root complex

This patch adds enables 3 instances of root complexes which are
exposed on DB820c board. 3 Instances are terminted as below
PCIE0 => QCA6174
PCIE1 => MINI PCIE CARD
PCIE2 => GBE ETHERNET
Signed-off-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: NAndy Gross <andy.gross@linaro.org>

arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi

@@ -138,6 +138,22 @@
 			pinctrl-names = "default";
 			pinctrl-0 = <&usb2_vbus_det_gpio>;
 		};
+
+		agnoc@0 {
+			qcom,pcie@00600000 {
+				perst-gpio = <&msmgpio 35 GPIO_ACTIVE_LOW>;
+			};
+
+			qcom,pcie@00608000 {
+				status = "okay";
+				perst-gpio = <&msmgpio 130 GPIO_ACTIVE_LOW>;
+			};
+
+			qcom,pcie@00610000 {
+				status = "okay";
+				perst-gpio = <&msmgpio 114 GPIO_ACTIVE_LOW>;
+			};
+		};
 	};