ARM: dts: stm32: keep uart nodes behavior on stm32mp15xx-dhcom-pdk2

DMA configuration is added to uart nodes in stm32mp15x device tree.
Delete usart3 and uart8 DMA property in stm32mp15xx-dhcom-pdk2 board
device tree to keep current behavior.
Signed-off-by: NErwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: NAlexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/stm32mp15xx-dhcom-pdk2.dtsi

@@ -287,6 +287,8 @@
 &usart3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&usart3_pins_a>;
+	/delete-property/dmas;
+	/delete-property/dma-names;
 	status = "okay";
 };
 
@@ -294,6 +296,8 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart8_pins_a &uart8_rtscts_pins_a>;
 	uart-has-rtscts;
+	/delete-property/dmas;
+	/delete-property/dma-names;
 	status = "okay";
 };