iio:proximity:sx9360: Add sx9360 support

A simplified version of SX9324, it only have one pin and
2 phases (aka channels).
Only one event is presented.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20220101203800.290387-2-gwendal@chromium.org


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>