dt-bindings: vendor-prefixes: Add Cool Pi

Add vendor prefix for Cool Pi(https://cool-pi.com/

)

Signed-off-by: Andy Yan <andyshrk@163.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231212124223.1897314-1-andyshrk@163.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>