1. add uart APDMA controller device node
2. add uart 0/1/2/3/4/5 DMA function
Signed-off-by: Long Cheng <long.cheng@mediatek.com>
Link: https://lore.kernel.org/r/1556336193-15198-3-git-send-email-long.cheng@mediatek.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>