arm: dts: dra7x: Non-functional changes sync with v6.3-rc6

This is a collection of all the whitespace, renames, comment, and other
changes that should not change the DT functionality from Linux v6.3-rc6.

Signed-off-by: Andrew Davis <afd@ti.com>
diff --git a/arch/arm/dts/am571x-idk.dts b/arch/arm/dts/am571x-idk.dts
index cca7a25..b3592b2 100644
--- a/arch/arm/dts/am571x-idk.dts
+++ b/arch/arm/dts/am571x-idk.dts
@@ -74,17 +74,17 @@
 
 &mailbox5 {
 	status = "okay";
-	mbox_ipu1_ipc3x: mbox_ipu1_ipc3x {
+	mbox_ipu1_ipc3x: mbox-ipu1-ipc3x {
 		status = "okay";
 	};
-	mbox_dsp1_ipc3x: mbox_dsp1_ipc3x {
+	mbox_dsp1_ipc3x: mbox-dsp1-ipc3x {
 		status = "okay";
 	};
 };
 
 &mailbox6 {
 	status = "okay";
-	mbox_ipu2_ipc3x: mbox_ipu2_ipc3x {
+	mbox_ipu2_ipc3x: mbox-ipu2-ipc3x {
 		status = "okay";
 	};
 };