ARM: dts: stm32: keep uart4 behavior on stm32mp157c-lxa-mc1

DMA configuration is added to uart nodes in stm32mp15x device tree.
Delete uart4 DMA property in stm32mp157c-lxa-mc1 board device tree to
keep console in irq mode, as DMA support for console has been removed
from the driver by commit e359b441 ("serial: stm32: fix threaded
interrupt handling").
Signed-off-by: NErwan Le Ray <erwan.leray@foss.st.com>
Reviewed-by: NAhmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: NAlexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts

@@ -248,5 +248,7 @@
 &uart4 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart4_pins_a>;
+	/delete-property/dmas;
+	/delete-property/dma-names;
 	status = "okay";
 };