Added support to LPS22DF ST MEMS pressure and temperature sensor
List of supported features:
- Configurable ODRs [Power_Off ... 200] Hz
- Sensor Event Timestamp support
- Read single raw data values for pressure and temperature
- FIFO:
> Pressure data stored in FIFO
> HW Watermark configuration
> Custom Flush command / event support
Signed-off-by: mario tesi <mario.tesi@st.com>
Change-Id: Ia3be1f93498c6c46345a067c6323968a94014662
