iio: pressure: st: Add support for new LPS001WP pressure sensor

Here we use existing practices to introduce support for another
pressure/temperature sensor, the LPS001WP.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --cc drivers/iio/pressure/st_pressure.h
Simple merge

diff --cc drivers/iio/pressure/st_pressure_core.c
Simple merge

diff --cc drivers/iio/pressure/st_pressure_i2c.c
Simple merge