spi: st-ssc4: Remove duplicate code to test unsupported mode bits
spi_setup() will test unsupported mode bits before calling spi->master->setup. Thus remove duplicate code to test unsupported mode bits in spi_st_setup(). Signed-off-by: NAxel Lin <axel.lin@ingics.com> Signed-off-by: NMark Brown <broonie@kernel.org>
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