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

Update st,st-sensors bindings for STMicroelectronics LIS302DL variant

Reviewed-by: Linus Walleij <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Sicelo A. Mhlongo <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

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

···
           - st,lis2dw12
           - st,lis2hh12
           - st,lis2dh12-accel
+          - st,lis302dl
           - st,lis331dl-accel
           - st,lis331dlh-accel
           - st,lis3de