sunxi:nand:add normal timeout
sunxi:nand: undo timout as not workable
sunxi:wemac: remove unused dma irq poll code

dma irq pull, means bring work when irq is disabled
using polling - endless checking irq status, that
code currently disabled in wemac, but export sitll
here and I need remove it for next patch
Signed-off-by: Alexsey Shestacov <wingrime@gmail.com>