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Similar to i2c_xfer: allow access to a SPI device registers. We assume the protocol use is set MSB bit to the offset for read operation. id is the index of the device in spi_devices. BRANCH=smaug TEST=Read/Write SPI registers. BUG=none Change-Id: Id4aaffbb6f514fd47086aee240b556ea23298d33 Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/289857 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>