FIXUP: arm64: dts: qcom: monaco-evk: Restore Bluetooth nodes dropped in common dtsi refactor

Commit 8fad712 ("FROMLIST: arm64: dts: qcom: monaco-evk: Extract
common EVK hardware into shared dtsi") refactored monaco-evk.dts into
a new shared monaco-evk-common.dtsi to support the monaco-ac-evk board
variant. Despite claiming "No functional change intended", the commit
accidentally omitted three Bluetooth-critical pieces that were present
in the original monaco-evk.dts:

  1. The 'serial1 = &uart2' alias in the aliases block
  2. The vreg_dcin_12v and vreg_wcn_3p3 fixed regulators in the root
     node (vreg_wcn_3p3 is the power supply for the WCN6855 BT chip,
     and depends on vreg_dcin_12v as its vin-supply)
  3. The &uart2 node containing the bluetooth child node with
     compatible = "qcom,wcn6855-bt" and all its regulator supplies

As a result, Bluetooth stopped working on monaco-evk devices after
tag qcom-6.18.y-20260414 which included PR qualcomm-linux#415.

Restore all three missing pieces into monaco-evk-common.dtsi so that
both monaco-evk and monaco-ac-evk boards correctly inherit the WCN6855
Bluetooth hardware description via the shared dtsi.

Fixes: 8fad712 ("FROMLIST: arm64: dts: qcom: monaco-evk: Extract common EVK hardware into shared dtsi")
Signed-off-by: Salendarsingh Gaud <sgaud@qti.qualcomm.com>

Author: sgaud-quic

arch/arm64/boot/dts/qcom/monaco-evk-common.dtsi

@@ -16,6 +16,7 @@
 		ethernet0 = &ethernet0;
 		i2c1 = &i2c1;
 		serial0 = &uart7;
+		serial1 = &uart2;
 		serial2 = &uart6;
 	};
 
@@ -167,6 +168,29 @@
 		pinctrl-0 = <&cam2_avdd_2v8_en_default>;
 		pinctrl-names = "default";
 	};
+
+	vreg_dcin_12v: regulator-dcin-12v {
+		compatible = "regulator-fixed";
+
+		regulator-name = "VREG_DCIN_12V";
+		regulator-min-microvolt = <12000000>;
+		regulator-max-microvolt = <12000000>;
+
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
+	vreg_wcn_3p3: regulator-wcn-3p3 {
+		compatible = "regulator-fixed";
+
+		regulator-name = "VREG_WCN_3P3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+
+		vin-supply = <&vreg_dcin_12v>;
+
+		regulator-boot-on;
+	};
 };
 
 &apps_rsc {
@@ -837,6 +861,24 @@
 	};
 };
 
+&uart2 {
+	status = "okay";
+
+	bluetooth: bluetooth {
+		compatible = "qcom,wcn6855-bt";
+		max-speed = <3200000>;
+
+		vddrfacmn-supply = <&vreg_wcn_3p3>;
+		vddaon-supply = <&vreg_wcn_3p3>;
+		vddwlcx-supply = <&vreg_wcn_3p3>;
+		vddwlmx-supply = <&vreg_wcn_3p3>;
+		vddbtcmx-supply = <&vreg_wcn_3p3>;
+		vddrfa0p8-supply = <&vreg_wcn_3p3>;
+		vddrfa1p2-supply = <&vreg_wcn_3p3>;
+		vddrfa1p8-supply = <&vreg_wcn_3p3>;
+	};
+};
+
 &uart6 {
 	status = "okay";
 };