ARM: dts: imx6qdl/imx6sl: add the dma property for uart

Add the dma property for all the uart.

Note: Add the dma property does not mean we enable the dma for this
uart.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
3 files changed