dt-bindings:iio:samsung,sensorhub-rinato: yaml conversion

Renamed to be more specific as I would be surprised if this is the only
sensorhub Samsung have ever shipped.
Fixed missing reg property in the example

Karol's email address from original patch is bouncing, so I've
put myself as maintainer until someone else steps up.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201031184854.745828-7-jic23@kernel.org