docs: zh_CN/devicetree: sync usage-model fix

Sync compatibly string fix from the English document.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/b39560250cb58f8cdcfe95791ce5af7455c6e8e3.1682333574.git.baruch@tkos.co.il


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