dt-bindings: proximity: vl53l0x: Document optional supply and GPIO properties

Add the optional properties for the VL53L0X ToF sensor to the
device-tree binding.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
Link: https://lore.kernel.org/r/20220523175344.5845-2-markuss.broks@gmail.com


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