dt-bindings: vendor-prefixes: Add ALFA Network

Add vendor prefix for ALFA Network Inc.

https://www.alfa.com.tw/



Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221013155418.47577-1-krzysztof.kozlowski@linaro.org