arm64: dts: allwinner: a100: Add I2C DMA requests

The I2C controllers in the A100 SoC are all connected to the DMA engine.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220830020824.62288-4-samuel@sholland.org