ARM: sunxi: DT: Convert the DTs to use a header for the DMA arguments

The DMA engine for the A10/A20 and derivatives require an opaque extra
argument.

Add a dt-bindings header, and convert the device trees to it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --cc arch/arm/boot/dts/sun4i-a10.dtsi
Simple merge

diff --cc arch/arm/boot/dts/sun5i-a10s.dtsi
Simple merge

diff --cc arch/arm/boot/dts/sun5i-a13.dtsi
Simple merge

diff --cc arch/arm/boot/dts/sun7i-a20.dtsi
Simple merge

diff --cc include/dt-bindings/dma/sun4i-a10.h
Simple merge