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This allows us to use the two SPI ports as SPI master. Also, to save CPU time on reading large amount of data, let's add an async interface for SPI transaction. BUG=chrome-os-partner:29805 TEST=Read manufacturer ID from SPI flash with sync/async interface BRANCH=None Change-Id: I427f4215602cccc55c4151f4116226b1e0ccc15e Signed-off-by: Vic Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/204719