iio: adc: qcom-spmi-rradc: Fix spelling mistake "coherrency" -> "coherency"

There is a spelling mistake in a dev_err message. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220621094736.90436-1-colin.i.king@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>