omap-dma + 8250_omap: fix the dmaengine_pause()

[Sebastian Andrzej Siewior]

#1 is something that can go stable and disables RX-DMA should it
   notice that it does not work.
#2 adds the anotation as suggest by Russell.
#3 adds the missing feature to omap-dma so dmaengine_pause() works. Once
   this is merged, the warning from #1 disappears.

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