dt-bindings: iio: st,st-sensors add LPS22DF.

Add support for the ST LPS22DF, an I2C/SPI pressure sensor.
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220909161611.780720-1-martyn.welch@collabora.co.ukSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/st,st-sensors.yaml

@@ -73,6 +73,7 @@ properties:
       - description: STMicroelectronics Pressure Sensors
         enum:
           - st,lps001wp-press
+          - st,lps22df
           - st,lps22hb-press
           - st,lps22hh
           - st,lps25h-press
@@ -141,6 +142,7 @@ allOf:
             - st,lis2mdl
             - st,lis3l02dq
             - st,lis3lv02dl-accel
+            - st,lps22df
             - st,lps22hb-press
             - st,lps22hh
             - st,lps25h-press