Add support for STMicroelectronics LISHH12 accelerometer in st_accel
framework.

https://www.st.com/resource/en/datasheet/lis2hh12.pdfSigned-off-by: Gaëtan André <rvlander@gaetanandre.eu>
Reviewed-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>