dt-bindings: vendor-prefixes: Add luckfox prefix

dt-bindings: vendor-prefixes: Add luckfox prefix

Add vendor prefix for Shenzhen Luckfox Technology Co., Ltd., which
produces development boards like the Luckfox Omni3576.

Signed-off-by: John Clark <inindev@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Link: https://lore.kernel.org/r/20250516002713.145026-2-inindev@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>