优化 spoof build vars，新的配置格式请参阅 README (@yujincheng08 @osm0sis ) 自带 AOSP 软 keybox 并默认启用 spoof build vars 支持在生成密钥对模式下启用设备属性认证 生成密钥支持 Strongbox

Refine spoof build vars, please refer to README for new config format Ship with AOSP software keybox and enable spoof build vars by default Support device properties attestation for generating keypair Support strongbox keypair generation