dt-bindings: iio: st-sensors: Add IIS328DQ accelerometer

dt-bindings: iio: st-sensors: Add IIS328DQ accelerometer

The ST IIS328DQ is an accelerometer sensor, which is compatible with
the already supported ST H3LIS331DL. So add the new compatible
with a fallback to the ST sensor binding.

Link: https://lore.kernel.org/linux-iio/2bac9ecf-9d2e-967e-9020-1c950487d781@i2se.com/
Suggested-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Stefan Wahren <stefan.wahren@chargebyte.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230317103323.7741-5-stefan.wahren@chargebyte.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>