Support Breed Mode

[GenzPN]

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1.关于你要提交的问题

Add support breed format support Q：是否搜索了issue (使用 "x" 选择)

• [x] 没有类似的issue

2. 详细叙述

I use this code to build my Router but i have a problem is there is don't have breed support Sample : openwrt-ramips-mt7621-xiaomi_mi-router-3g-squashfs-breed-factory.bin

(1) 具体问题

A:

(2) 路由器型号和固件版本

A：Xiaomi mi router 3g

(3) 详细日志

A：

[GenzPN]

Hello ? @coolsnowwolf