dt-bindings: vendor-prefixes: Add Cameo Communications

Add entry for Cameo Communications (https://www.cameo.com.tw/

)

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>