dt-bindings: power: max77650: convert the binding document to yaml

Convert the binding document for MAX77650 charger module to YAML.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>