dt-bindings:iio:light:capella,cm36651: txt to yaml conversion.

Straight forward conversion with no changes beyond the node
name in the example

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Beomho Seo <beomho.seo@samsung.com>
Link: https://lore.kernel.org/r/20201031184854.745828-16-jic23@kernel.org