dts: arm: silabs: Move efr32bg27 to xg27 directory

Introduce subdirectory for xg27 socs.

Signed-off-by: Aksel Skauge Mellbye <aksel.mellbye@silabs.com>

Author: asmellby

boards/silabs/dev_kits/xg27_dk2602a/xg27_dk2602a.dts

@@ -5,7 +5,7 @@
  */
 
 /dts-v1/;
-#include <silabs/efr32bg27.dtsi>
+#include <silabs/xg27/efr32bg27c140f768im40.dtsi>
 #include "xg27_dk2602a-pinctrl.dtsi"
 #include "thunderboard.dtsi"
 #include <zephyr/dt-bindings/regulator/silabs_dcdc.h>

dts/arm/silabs/efr32bg27.dtsi

@@ -0,0 +1,7 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <silabs/xg27/efr32xg27.dtsi>

dts/arm/silabs/xg27/efr32bg27.dtsi

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <silabs/xg27/efr32bg27.dtsi>
+#include <mem.h>
+
+/ {
+	soc {
+		compatible = "silabs,efr32bg27c140f768im40", "silabs,efr32mg27", "silabs,xg27",
+			     "silabs,efr32", "simple-bus";
+	};
+};
+
+&flash0 {
+	reg = <0x08000000 DT_SIZE_K(768)>;
+};
+
+&sram0 {
+	reg = <0x20000000 DT_SIZE_K(64)>;
+};

dts/arm/silabs/xg27/efr32bg27c140f768im40.dtsi

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <silabs/xg27/xg27.dtsi>
+
+/ {
+	soc {
+		radio: radio@b0000000 {
+			compatible = "silabs,series2-radio";
+			reg = <0xb0000000 0x1000000>;
+			interrupts = <36 1>, <37 1>, <38 1>, <39 1>, <40 1>, <41 1>,
+				     <42 1>, <43 1>, <44 1>, <45 1>, <46 1>, <47 1>;
+			interrupt-names = "agc", "bufc", "frc_pri", "frc", "modem", "protimer",
+					  "rac_rsm", "rac_seq", "rdmailbox", "rfsense", "synth",
+					  "prortc";
+			pa-initial-power-dbm = <10>;
+			pa-ramp-time-us = <2>;
+			pa-voltage-mv = <3300>;
+			pa-2p4ghz = "highest";
+
+			bt_hci_silabs: bt_hci_silabs {
+				compatible = "silabs,bt-hci-efr32";
+				status = "disabled";
+			};
+		};
+	};
+};