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The definition of SPI_FULL_DUPLEX (3) is really SPI_TX_ONLY (1) ORed
with SPI_RX_ONLY (2). Let's drop the define and simplify the code here a
bit by collapsing the setting of 'm_cmd' into conditions that are the
same.

This is a non-functional change, just cleanup to consolidate code.
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Cc: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20200618233959.160032-1-swboyd@chromium.org

Signed-off-by: Mark Brown <broonie@kernel.org>