spi: sc18is602: Change gpiod_set_value to gpiod_set_value_cansleep

To avoid warning when using i2c gpio expander change call to the
cansleep variant. There should be no issue with sleeping in the
drivers probe function.

Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Mark Brown <broonie@kernel.org>