dt-bindings: vendor-prefixes: Add Novtech Vendor Prefix

Add vendor prefix for NovTech, Inc.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>