spi: spi-fsl-dspi: Fix typos

mask of -> mask off
at and -> and

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20190818180115.31114-12-olteanv@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed