dt-bindings: iio: st,st-sensors add LIS302DL

Update st,st-sensors bindings for STMicroelectronics LIS302DL variant
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sicelo A. Mhlongo <absicsz@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220307132502.73854-2-absicsz@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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

@@ -29,6 +29,7 @@ properties:
           - st,lis2dw12
           - st,lis2hh12
           - st,lis2dh12-accel
+          - st,lis302dl
           - st,lis331dl-accel
           - st,lis331dlh-accel
           - st,lis3de