iio: light: Add device tree binding for vishay vcnl4035

Adding device tree binding for vcnl4035 and vendor
prefix for Vishay Intertechnology

Signed-off-by: Parthiban Nallathambi <pn@denx.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>