DMA configuration is added to uart nodes in stm32mp15x device tree.
Delete usart3 and uart8 nodes DMA property in stm32mp15xx-dhcom-picoitx
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>