arm64: dts: imx8mp: rename DHCOM SoM overlays to .dtso

Distinguish more clearly between source files meant for producing .dtb
from those meant for producing .dtbo. No functional change, as we
currently have rules for producing a foo.dtbo from either foo.dts or
foo.dtso.

Note that in the linux tree, all device tree overlay sources have been
renamed to .dtso, and the .dts->.dtbo rule is gone since v6.5 (commit
81d362732bac). So this is also a step towards staying closer to linux
with respect to both Kbuild and device tree sources.

Cc: Marek Vasut <marex@denx.de>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/arch/arm/dts/imx8mp-dhcom-pdk-overlay-eth2xfast.dts b/arch/arm/dts/imx8mp-dhcom-pdk-overlay-eth2xfast.dtso
similarity index 100%
rename from arch/arm/dts/imx8mp-dhcom-pdk-overlay-eth2xfast.dts
rename to arch/arm/dts/imx8mp-dhcom-pdk-overlay-eth2xfast.dtso
diff --git a/arch/arm/dts/imx8mp-dhcom-pdk3-overlay-rev100.dts b/arch/arm/dts/imx8mp-dhcom-pdk3-overlay-rev100.dtso
similarity index 100%
rename from arch/arm/dts/imx8mp-dhcom-pdk3-overlay-rev100.dts
rename to arch/arm/dts/imx8mp-dhcom-pdk3-overlay-rev100.dtso
diff --git a/arch/arm/dts/imx8mp-dhcom-som-overlay-eth1xfast.dts b/arch/arm/dts/imx8mp-dhcom-som-overlay-eth1xfast.dtso
similarity index 100%
rename from arch/arm/dts/imx8mp-dhcom-som-overlay-eth1xfast.dts
rename to arch/arm/dts/imx8mp-dhcom-som-overlay-eth1xfast.dtso
diff --git a/arch/arm/dts/imx8mp-dhcom-som-overlay-eth2xfast.dts b/arch/arm/dts/imx8mp-dhcom-som-overlay-eth2xfast.dtso
similarity index 91%
rename from arch/arm/dts/imx8mp-dhcom-som-overlay-eth2xfast.dts
rename to arch/arm/dts/imx8mp-dhcom-som-overlay-eth2xfast.dtso
index 82dadce..f2d768c 100644
--- a/arch/arm/dts/imx8mp-dhcom-som-overlay-eth2xfast.dts
+++ b/arch/arm/dts/imx8mp-dhcom-som-overlay-eth2xfast.dtso
@@ -2,7 +2,7 @@
 /*
  * Copyright (C) 2023 Marek Vasut <marex@denx.de>
  */
-#include "imx8mp-dhcom-som-overlay-eth1xfast.dts"
+#include "imx8mp-dhcom-som-overlay-eth1xfast.dtso"
 
 /* Dual RMII 100/Full Fast ethernet on this SoM variant. */
 
diff --git a/arch/arm/dts/imx8mp-dhcom-som-overlay-rev100.dts b/arch/arm/dts/imx8mp-dhcom-som-overlay-rev100.dtso
similarity index 100%
rename from arch/arm/dts/imx8mp-dhcom-som-overlay-rev100.dts
rename to arch/arm/dts/imx8mp-dhcom-som-overlay-rev100.dtso