dt-bindings: vendor-prefixes: Add prefix for belling

Add a vendor prefix entry for belling (https://www.belling.com.cn

)

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230710165228.105983-2-sebastian.reichel@collabora.com


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