iio: pressure: st_pressure: fix drdy configuration for LPS22HB and LPS25H

Remove int2 configuration parameter for LPS22HB and LPS25H since
these devices export just int1 as data-ready line

Fixes: 93187840 (iio:pressure: Add support for LPS25H pressure sensor)
Fixes: e039e2f5 (iio:st_pressure:initial lps22hb sensor support)
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>