dt-bindings:iio:health:maxim,max30100: txt to yaml conversion

Straight forward conversion. As with other bindings I've dropped
any standrd description, but kept the unusual bits, in thisscase
the maxim,led-current-microamp and it's description.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Link: https://lore.kernel.org/r/20201031184854.745828-10-jic23@kernel.org