dts: arm: silabs: Clean up xg23 dts files

Reformat devicetree files according to
<https://docs.zephyrproject.org/latest/contribute/style/devicetree.html>
and <https://docs.kernel.org/devicetree/bindings/dts-coding-style.html>:

 * Sort nodes by unit address or name
 * Sort properties by category and name

Add missing MPU node.

Signed-off-by: Aksel Skauge Mellbye <[email protected]>

Author: asmellby

dts/arm/silabs/xg23/efm32pg23.dtsi

@@ -0,0 +1,7 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <silabs/xg23/xg23.dtsi>

dts/arm/silabs/xg23/efm32pg23b310f512im48.dtsi

@@ -1,19 +1,17 @@
 /*
  * Copyright (c) 2025 Christoph Jans
+ * Copyright (c) 2025 Silicon Laboratories Inc.
  *
  * SPDX-License-Identifier: Apache-2.0
  */
 
 #include <mem.h>
-#include <silabs/xg23/xg23.dtsi>
+#include <silabs/xg23/efm32pg23.dtsi>
 
 / {
 	soc {
-		compatible = "silabs,efm32pg23b310f512im48",
-			     "silabs,efm32pg23",
-			     "silabs,xg23",
-			     "silabs,efm32",
-			     "simple-bus";
+		compatible = "silabs,efm32pg23b310f512im48", "silabs,efm32pg23", "silabs,xg23",
+			     "silabs,efm32", "simple-bus";
 	};
 };
 

dts/arm/silabs/xg23/efr32xg23.dtsi

@@ -10,16 +10,16 @@
 	soc {
 		radio: radio@b0000000 {
 			compatible = "silabs,series2-radio";
-			reg = <0xb0000000 0x1000000>;
-			interrupts = <31 1>, <32 1>, <33 1>, <34 1>, <35 1>, <36 1>,
-				     <37 1>, <38 1>, <39 1>, <40 1>, <74 1>, <75 1>;
+			reg = <0xb0000000 0x01000000>;
 			interrupt-names = "agc", "bufc", "frc_pri", "frc", "modem", "protimer",
-					  "rac_rsm", "rac_seq", "hostmailbox", "synth",
-					  "rfeca0", "rfeca1";
+					  "rac_rsm", "rac_seq", "hostmailbox", "synth", "rfeca0",
+					  "rfeca1";
+			interrupts = <31 1>, <32 1>, <33 1>, <34 1>, <35 1>, <36 1>, <37 1>,
+				     <38 1>, <39 1>, <40 1>, <74 1>, <75 1>;
 			pa-initial-power-dbm = <10>;
 			pa-ramp-time-us = <10>;
-			pa-voltage-mv = <3300>;
 			pa-subghz = "highest";
+			pa-voltage-mv = <3300>;
 
 			pti: pti {
 				compatible = "silabs,pti";