dt-bindings: add vendor prefix for YIC System Co., Ltd

Add vendor prefix for YIC System Co., Ltd (http://www.yicsystem.com

).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210315124423.115039-2-krzysztof.kozlowski@canonical.com


Signed-off-by: Rob Herring <robh@kernel.org>