spi/spidev_test: Document -N/--no-cs and -R/--ready

commit b55f627feeb9d48fdbde3835e18afbc76712e49b ("spi: new spi->mode bits")
added two new command line options without adding the respective help
texts.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
1 file changed