iio:pressure: Changed pressure data variable name to press_data

This patch fix pressure data variable name. Usually pdata name
it is used for platform data.

Signed-off-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

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

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

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

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