ARM: dts: stm32: Move vdd_io extras into Avenger96 extras

The vdd_io regulator is present only on DHCOR SoM configured for 1V8 IO,
as populated on Avenger96, but not present on 3V3 DHCOR SoM. Move these
extras to Avenger96 u-boot DT extras.

Fixes: 3919aa1722a ("ARM: dts: stm32: Add DFU support for DHCOR recovery")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi b/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi
index 6e6543b..5bed53e 100644
--- a/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi
@@ -101,3 +101,7 @@
 	u-boot,force-b-session-valid;
 	hnp-srp-disable;
 };
+
+&vdd_io {
+	u-boot,dm-spl;
+};
diff --git a/arch/arm/dts/stm32mp15xx-dhcor-u-boot.dtsi b/arch/arm/dts/stm32mp15xx-dhcor-u-boot.dtsi
index cd3190c..19f4221 100644
--- a/arch/arm/dts/stm32mp15xx-dhcor-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp15xx-dhcor-u-boot.dtsi
@@ -203,10 +203,6 @@
 	u-boot,dm-spl;
 };
 
-&vdd_io {
-	u-boot,dm-spl;
-};
-
 &vdd_usb {
 	u-boot,dm-spl;
 };